Mac: Correctly show/hide compositor on navigations.

chrome/browser/renderer_host/render_widget_host_view_mac.mm

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <QuartzCore/QuartzCore.h>
 
 #include "chrome/browser/renderer_host/render_widget_host_view_mac.h"
 
 #include "app/surface/io_surface_support_mac.h"
 #import "base/chrome_application_mac.h"
@@ skipping 828 matching lines @@
 
   plugin_container_manager_.SetSurfaceWasPaintedTo(window);
   AcceleratedPluginView* view =
       static_cast<AcceleratedPluginView*>(it->second);
   // The surface is hidden until its first paint, to not show gargabe.
   if (plugin_container_manager_.SurfaceShouldBeVisible(window))
     [view setHidden:NO];
   [view setSurfaceWasSwapped:YES];
 }
 
+void RenderWidgetHostViewMac::GpuRenderingStateDidChange() {
+  // Plugins are destroyed on page navigate. The compositor layer on the other
+  // hand is created on demand and then stays alive until its renderer process
+  // dies (usually on cross-domain navigation). Instead, only a flag
+  // |is_gpu_rendering_active()| is flipped when the compositor output should be
+  // shown/hidden.
+  // Show/hide the view belonging to the compositor here.
+  plugin_container_manager_.set_gpu_rendering_active(
+      GetRenderWidgetHost()->is_gpu_rendering_active());
+
+  gfx::PluginWindowHandle root_handle =
+      plugin_container_manager_.root_container_handle();
+  if (root_handle != gfx::kNullPluginWindow) {
+    PluginViewMap::iterator it = plugin_views_.find(root_handle);
+    DCHECK(plugin_views_.end() != it);
+    if (plugin_views_.end() == it) {
+      return;
+    }
+    bool visible =
+        plugin_container_manager_.SurfaceShouldBeVisible(root_handle);
+    [it->second setHidden:!visible];
+  }
+}
+
 void RenderWidgetHostViewMac::DrawAcceleratedSurfaceInstance(
       CGLContextObj context, gfx::PluginWindowHandle plugin_handle) {
   // Called on the display link thread.
   PluginViewMap::iterator it = plugin_views_.find(plugin_handle);
   DCHECK(plugin_views_.end() != it);
   if (plugin_views_.end() == it) {
     return;
   }
   CGLSetCurrentContext(context);
   // TODO(thakis): Pixel or view coordinates?
   NSSize size = [it->second frame].size;
 
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
   // Note that we place the origin at the upper left corner with +y
   // going down
   glOrtho(0, size.width, size.height, 0, -1, 1);
   glMatrixMode(GL_MODELVIEW);
   glLoadIdentity();
 
-  plugin_container_manager_.Draw(
-      context,
-      plugin_handle,
-      GetRenderWidgetHost()->is_gpu_rendering_active());
+  plugin_container_manager_.Draw(context, plugin_handle);
 }
 
 void RenderWidgetHostViewMac::ForceTextureReload() {
   plugin_container_manager_.ForceTextureReload();
 }
 
 void RenderWidgetHostViewMac::SetVisuallyDeemphasized(bool deemphasized) {
   // Mac uses tab-modal sheets, so this is a no-op.
 }
 
@@ skipping 1434 matching lines @@
   if (!string) return NO;
 
   // If the user is currently using an IME, confirm the IME input,
   // and then insert the text from the service, the same as TextEdit and Safari.
   [self confirmComposition];
   [self insertText:string];
   return YES;
 }
 
 @end