Bug 591047 - (3/7) Adding e10s IME supporting code to widget; r=cjones sr=roc a=blocking-fennec

widget/public/nsIWidget.h

@@ -117,10 +117,10 @@ typedef nsEventStatus (* EVENT_CALLBACK)(nsGUIEvent *event);
 #define NS_NATIVE_TSF_DISPLAY_ATTR_MGR 102
 #endif
 
-// 36762512-d533-4884-9ac3-4ada8594146c
+// 8bd36c8c-8218-4859-bfbc-ca5d78b52f7d
 #define NS_IWIDGET_IID \
-  { 0x36762512, 0xd533, 0x4884, \
-    { 0x9a, 0xc3, 0x4a, 0xda, 0x85, 0x94, 0x14, 0x6c } }
+  { 0x8bd36c8c, 0x8218, 0x4859, \
+    { 0xbf, 0xbc, 0xca, 0x5d, 0x78, 0xb5, 0x2f, 0x7d } }
 
 /*
  * Window shadow styles
@@ -189,6 +189,38 @@ enum nsTopLevelWidgetZPlacement { // for PlaceBehind()
 };
 
 
+/**
+ * Preference for receiving IME updates
+ *
+ * If mWantUpdates is true, PuppetWidget will forward
+ * nsIWidget::OnIMETextChange and nsIWidget::OnIMESelectionChange to the chrome
+ * process. This incurs overhead from observers and IPDL. If the IME
+ * implementation on a particular platform doesn't care about OnIMETextChange
+ * and OnIMESelectionChange from content processes, they should set
+ * mWantUpdates to false to avoid these overheads.
+ *
+ * If mWantHints is true, PuppetWidget will forward the content of text fields
+ * to the chrome process to be cached. This way we return the cached content
+ * during query events. (see comments in bug 583976). This only makes sense
+ * for IME implementations that do use query events, otherwise there's a
+ * significant overhead. Platforms that don't use query events should set
+ * mWantHints to false.
+ */
+struct nsIMEUpdatePreference {
+
+  nsIMEUpdatePreference()
+    : mWantUpdates(PR_FALSE), mWantHints(PR_FALSE)
+  {
+  }
+  nsIMEUpdatePreference(PRBool aWantUpdates, PRBool aWantHints)
+    : mWantUpdates(aWantUpdates), mWantHints(aWantHints)
+  {
+  }
+  PRPackedBool mWantUpdates;
+  PRPackedBool mWantHints;
+};
+
+
 /**
  * The base class for all the widgets. It provides the interface for
  * all basic and necessary functionality.
@@ -1220,6 +1252,11 @@ class nsIWidget : public nsISupports {
      */
     NS_IMETHOD OnIMESelectionChange(void) = 0;
 
+    /*
+     * Retrieves preference for IME updates
+     */
+    virtual nsIMEUpdatePreference GetIMEUpdatePreference() = 0;
+
     /*
      * Call this method when a dialog is opened which has a default button.
      * The button's rectangle should be supplied in aButtonRect.

widget/src/android/nsWindow.cpp

@@ -1692,3 +1692,9 @@ nsWindow::OnIMESelectionChange(void)
     return NS_OK;
 }
 
+nsIMEUpdatePreference
+nsWindow::GetIMEUpdatePreference()
+{
+    return nsIMEUpdatePreference(PR_TRUE, PR_TRUE);
+}
+

widget/src/android/nsWindow.h

@@ -159,6 +159,7 @@ public:
     NS_IMETHOD OnIMEFocusChange(PRBool aFocus);
     NS_IMETHOD OnIMETextChange(PRUint32 aStart, PRUint32 aOldEnd, PRUint32 aNewEnd);
     NS_IMETHOD OnIMESelectionChange(void);
+    virtual nsIMEUpdatePreference GetIMEUpdatePreference();
 
     LayerManager* GetLayerManager();
     gfxASurface* GetThebesSurface();

widget/src/xpwidgets/nsBaseWidget.h

@@ -151,6 +151,7 @@ public:
   NS_IMETHOD              OnIMEFocusChange(PRBool aFocus) { return NS_ERROR_NOT_IMPLEMENTED; }
   NS_IMETHOD              OnIMETextChange(PRUint32 aStart, PRUint32 aOldEnd, PRUint32 aNewEnd) { return NS_ERROR_NOT_IMPLEMENTED; }
   NS_IMETHOD              OnIMESelectionChange(void) { return NS_ERROR_NOT_IMPLEMENTED; }
+  virtual nsIMEUpdatePreference GetIMEUpdatePreference() { return nsIMEUpdatePreference(PR_FALSE, PR_FALSE); }
   NS_IMETHOD              OnDefaultButtonLoaded(const nsIntRect &aButtonRect) { return NS_ERROR_NOT_IMPLEMENTED; }
   NS_IMETHOD              OverrideSystemMouseScrollSpeed(PRInt32 aOriginalDelta, PRBool aIsHorizontal, PRInt32 &aOverriddenDelta);
   virtual already_AddRefed<nsIWidget>