Bug 1096093 - Send ThemeRefresh message from parent down to content process. r=smaug.

--HG--
extra : rebase_source : 2103f47a75612dc4f1b719f5913d6cc14be5fbf7

dom/ipc/PBrowser.ipdl

@@ -58,6 +58,7 @@ using mozilla::layers::GeckoContentController::APZStateChange from "mozilla/laye
 using mozilla::WritingMode from "mozilla/WritingModes.h";
 using mozilla::layers::TouchBehaviorFlags from "mozilla/layers/APZUtils.h";
 using nsIWidget::TouchPointerState from "nsIWidget.h";
+using struct LookAndFeelInt from "mozilla/widget/WidgetMessageUtils.h";
 
 namespace mozilla {
 namespace dom {
@@ -673,6 +674,12 @@ child:
      */
     UIResolutionChanged();
 
+    /**
+     * Tell the child that the system theme has changed, and that a repaint
+     * is necessary.
+     */
+    ThemeChanged(LookAndFeelInt[] lookAndFeelIntCache);
+
     /**
      * Tell the child of an app's offline status
      */

dom/ipc/TabChild.cpp

@@ -3140,8 +3140,27 @@ TabChild::RecvUIResolutionChanged()
   static_cast<PuppetWidget*>(mWidget.get())->ClearBackingScaleCache();
   nsCOMPtr<nsIDocument> document(GetDocument());
   nsCOMPtr<nsIPresShell> presShell = document->GetShell();
-  nsRefPtr<nsPresContext> presContext = presShell->GetPresContext();
+  if (presShell) {
-  presContext->UIResolutionChanged();
+    nsRefPtr<nsPresContext> presContext = presShell->GetPresContext();
+    if (presContext) {
+      presContext->UIResolutionChanged();
+    }
+  }
+  return true;
+}
+
+bool
+TabChild::RecvThemeChanged(nsTArray<LookAndFeelInt>&& aLookAndFeelIntCache)
+{
+  LookAndFeel::SetIntCache(aLookAndFeelIntCache);
+  nsCOMPtr<nsIDocument> document(GetDocument());
+  nsCOMPtr<nsIPresShell> presShell = document->GetShell();
+  if (presShell) {
+    nsRefPtr<nsPresContext> presContext = presShell->GetPresContext();
+    if (presContext) {
+      presContext->ThemeChanged();
+    }
+  }
   return true;
 }
 

dom/ipc/TabChild.h

@@ -480,6 +480,8 @@ public:
 
     virtual bool RecvUIResolutionChanged() override;
 
+    virtual bool RecvThemeChanged(nsTArray<LookAndFeelInt>&& aLookAndFeelIntCache) override;
+
     /**
      * Native widget remoting protocol for use with windowed plugins with e10s.
      */

dom/ipc/TabParent.cpp

@@ -24,6 +24,7 @@
 #include "mozilla/layers/CompositorParent.h"
 #include "mozilla/layers/InputAPZContext.h"
 #include "mozilla/layout/RenderFrameParent.h"
+#include "mozilla/LookAndFeel.h"
 #include "mozilla/MouseEvents.h"
 #include "mozilla/net/NeckoChild.h"
 #include "mozilla/Preferences.h"
@@ -992,6 +993,19 @@ TabParent::UIResolutionChanged()
   }
 }
 
+void
+TabParent::ThemeChanged()
+{
+  if (!mIsDestroyed) {
+    // The theme has changed, and any cached values we had sent down
+    // to the child have been invalidated. When this method is called,
+    // LookAndFeel should have the up-to-date values, which we now
+    // send down to the child. We do this for every remote tab for now,
+    // but bug 1156934 has been filed to do it once per content process.
+    unused << SendThemeChanged(LookAndFeel::GetIntCache());
+  }
+}
+
 void
 TabParent::RequestFlingSnap(const FrameMetrics::ViewID& aScrollId,
                             const mozilla::CSSPoint& aDestination)

dom/ipc/TabParent.h

@@ -246,6 +246,7 @@ public:
     void UpdateDimensions(const nsIntRect& rect, const ScreenIntSize& size);
     void UpdateFrame(const layers::FrameMetrics& aFrameMetrics);
     void UIResolutionChanged();
+    void ThemeChanged();
     void RequestFlingSnap(const FrameMetrics::ViewID& aScrollId,
                           const mozilla::CSSPoint& aDestination);
     void AcknowledgeScrollUpdate(const ViewID& aScrollId, const uint32_t& aScrollGeneration);

layout/base/nsPresContext.cpp

@@ -1702,6 +1702,12 @@ nsPresContext::ThemeChanged()
   }
 }
 
+static void
+NotifyThemeChanged(TabParent* aTabParent, void* aArg)
+{
+  aTabParent->ThemeChanged();
+}
+
 void
 nsPresContext::ThemeChangedInternal()
 {
@@ -1735,6 +1741,11 @@ nsPresContext::ThemeChangedInternal()
   // changes are not), and -moz-appearance (whose changes likewise are
   // not), so we need to reflow.
   MediaFeatureValuesChanged(eRestyle_Subtree, NS_STYLE_HINT_REFLOW);
+
+  // Recursively notify all remote leaf descendants that the
+  // system theme has changed.
+  nsContentUtils::CallOnAllRemoteChildren(mDocument->GetWindow(),
+                                          NotifyThemeChanged, nullptr);
 }
 
 void