diff --git a/dom/base/nsDOMWindowUtils.cpp b/dom/base/nsDOMWindowUtils.cpp
index 8164b5d59023..ce36e6f1bd27 100644
--- a/dom/base/nsDOMWindowUtils.cpp
+++ b/dom/base/nsDOMWindowUtils.cpp
@@ -477,10 +477,13 @@ nsDOMWindowUtils::SendMouseEvent(const nsAString& aType,
                                  PRInt32 aButton,
                                  PRInt32 aClickCount,
                                  PRInt32 aModifiers,
-                                 bool aIgnoreRootScrollFrame)
+                                 bool aIgnoreRootScrollFrame,
+                                 float aPressure,
+                                 unsigned short aInputSourceArg)
 {
   return SendMouseEventCommon(aType, aX, aY, aButton, aClickCount, aModifiers,
-                              aIgnoreRootScrollFrame, false);
+                              aIgnoreRootScrollFrame, false, aPressure,
+                              aInputSourceArg);
 }
 
 NS_IMETHODIMP
@@ -490,11 +493,14 @@ nsDOMWindowUtils::SendMouseEventToWindow(const nsAString& aType,
                                          PRInt32 aButton,
                                          PRInt32 aClickCount,
                                          PRInt32 aModifiers,
-                                         bool aIgnoreRootScrollFrame)
+                                         bool aIgnoreRootScrollFrame,
+                                         float aPressure,
+                                         unsigned short aInputSourceArg)
 {
   SAMPLE_LABEL("nsDOMWindowUtils", "SendMouseEventToWindow");
   return SendMouseEventCommon(aType, aX, aY, aButton, aClickCount, aModifiers,
-                              aIgnoreRootScrollFrame, true);
+                              aIgnoreRootScrollFrame, true, aPressure,
+                              aInputSourceArg);
 }
 
 static nsIntPoint
@@ -515,6 +521,8 @@ nsDOMWindowUtils::SendMouseEventCommon(const nsAString& aType,
                                        PRInt32 aClickCount,
                                        PRInt32 aModifiers,
                                        bool aIgnoreRootScrollFrame,
+                                       float aPressure,
+                                       unsigned short aInputSourceArg,
                                        bool aToWindow)
 {
   if (!IsUniversalXPConnectCapable()) {
@@ -545,13 +553,18 @@ nsDOMWindowUtils::SendMouseEventCommon(const nsAString& aType,
   } else
     return NS_ERROR_FAILURE;
 
+  if (aInputSourceArg == nsIDOMMouseEvent::MOZ_SOURCE_UNKNOWN) {
+    aInputSourceArg = nsIDOMMouseEvent::MOZ_SOURCE_MOUSE;
+  }
+
   nsMouseEvent event(true, msg, widget, nsMouseEvent::eReal,
                      contextMenuKey ?
                        nsMouseEvent::eContextMenuKey : nsMouseEvent::eNormal);
   event.modifiers = GetWidgetModifiers(aModifiers);
   event.button = aButton;
   event.widget = widget;
-
+  event.pressure = aPressure;
+  event.inputSource = aInputSourceArg;
   event.clickCount = aClickCount;
   event.time = PR_IntervalNow();
   event.flags |= NS_EVENT_FLAG_SYNTHETIC_TEST_EVENT;
diff --git a/dom/base/nsDOMWindowUtils.h b/dom/base/nsDOMWindowUtils.h
index df1dd7c96d6b..5d61cbfd57cf 100644
--- a/dom/base/nsDOMWindowUtils.h
+++ b/dom/base/nsDOMWindowUtils.h
@@ -42,6 +42,8 @@ protected:
                                   PRInt32 aClickCount,
                                   PRInt32 aModifiers,
                                   bool aIgnoreRootScrollFrame,
+                                  float aPressure,
+                                  unsigned short aInputSourceArg,
                                   bool aToWindow);
 
   static mozilla::widget::Modifiers GetWidgetModifiers(PRInt32 aModifiers);
diff --git a/dom/interfaces/base/nsIDOMWindowUtils.idl b/dom/interfaces/base/nsIDOMWindowUtils.idl
index cbd369c3cbc6..41ede6480dad 100644
--- a/dom/interfaces/base/nsIDOMWindowUtils.idl
+++ b/dom/interfaces/base/nsIDOMWindowUtils.idl
@@ -39,7 +39,7 @@ interface nsIFile;
 interface nsIDOMTouch;
 interface nsIDOMClientRect;
 
-[scriptable, uuid(5fc61d7b-a303-4f34-adfe-b7828675ba45)]
+[scriptable, uuid(f7222baa-7c4b-4079-a9e0-db13cf797f58)]
 interface nsIDOMWindowUtils : nsISupports {
 
   /**
@@ -215,6 +215,9 @@ interface nsIDOMWindowUtils : nsISupports {
    * @param aModifiers modifiers pressed, using constants defined as MODIFIER_*
    * @param aIgnoreRootScrollFrame whether the event should ignore viewport bounds
    *                           during dispatch
+   * @param aPressure touch input pressure: 0.0 -> 1.0
+   * @param aInputSourceArg input source, see nsIDOMMouseEvent for values,
+   *        defaults to mouse input.
    */
   void sendMouseEvent(in AString aType,
                       in float aX,
@@ -222,7 +225,9 @@ interface nsIDOMWindowUtils : nsISupports {
                       in long aButton,
                       in long aClickCount,
                       in long aModifiers,
-                      [optional] in boolean aIgnoreRootScrollFrame);
+                      [optional] in boolean aIgnoreRootScrollFrame,
+                      [optional] in float aPressure,
+                      [optional] in unsigned short aInputSourceArg);
 
   /** Synthesize a touch event. The event types supported are:
    *    touchstart, touchend, touchmove, and touchcancel
@@ -272,7 +277,9 @@ interface nsIDOMWindowUtils : nsISupports {
                               in long aButton,
                               in long aClickCount,
                               in long aModifiers,
-                              [optional] in boolean aIgnoreRootScrollFrame);
+                              [optional] in boolean aIgnoreRootScrollFrame,
+                              [optional] in float aPressure,
+                              [optional] in unsigned short aInputSourceArg);
 
   /** Synthesize a wheel event for a window. The event types supported is only
    *  wheel.
diff --git a/dom/ipc/TabChild.cpp b/dom/ipc/TabChild.cpp
index 5dae57e27a3a..3f0cc9e244a9 100644
--- a/dom/ipc/TabChild.cpp
+++ b/dom/ipc/TabChild.cpp
@@ -810,7 +810,7 @@ TabChild::RecvMouseEvent(const nsString& aType,
   nsCOMPtr<nsIDOMWindowUtils> utils = do_GetInterface(window);
   NS_ENSURE_TRUE(utils, true);
   utils->SendMouseEvent(aType, aX, aY, aButton, aClickCount, aModifiers,
-                        aIgnoreRootScrollFrame);
+                        aIgnoreRootScrollFrame, 0, 0);
   return true;
 }