Bug 1136487: Destroy the compositors for all windows when any window detects a device reset. r=jrmuizel

widget/windows/nsWindow.cpp

@@ -6538,6 +6538,15 @@ bool nsWindow::AutoErase(HDC dc)
   return false;
 }
 
+void
+nsWindow::ClearCompositor(nsWindow* aWindow)
+{
+  if (aWindow->mLayerManager) {
+    aWindow->mLayerManager = nullptr;
+    aWindow->DestroyCompositor();
+  }
+}
+
 bool
 nsWindow::ShouldUseOffMainThreadCompositing()
 {

widget/windows/nsWindow.h

@@ -238,6 +238,8 @@ public:
    */
   virtual bool            AutoErase(HDC dc);
 
+  static void             ClearCompositor(nsWindow* aWindow);
+
   /**
    * AssociateDefaultIMC() associates or disassociates the default IMC for
    * the window.

widget/windows/nsWindowGfx.cpp

@@ -193,8 +193,7 @@ bool nsWindow::OnPaint(HDC aDC, uint32_t aNestingLevel)
 
   if (gfxWindowsPlatform::GetPlatform()->DidRenderingDeviceReset()) {
     gfxWindowsPlatform::GetPlatform()->UpdateRenderMode();
-    mLayerManager = nullptr;
-    DestroyCompositor();
+    EnumAllWindows(ClearCompositor);
     return false;
   }