Add FrameHost mojo service

content/renderer/render_frame_impl.h

Index: content/renderer/render_frame_impl.h
diff --git a/content/renderer/render_frame_impl.h b/content/renderer/render_frame_impl.h
index 6ba4bb6ff5441baec59c37b82aaf2024797b70af..75b17d0fb56fd6a53991da8900dfe9982f5172aa 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -23,6 +23,7 @@
 #include "build/build_config.h"
 #include "content/common/accessibility_mode_enums.h"
 #include "content/common/frame_message_enums.h"
+#include "content/common/host_zoom_level.mojom.h"
 #include "content/common/mojo/service_registry_impl.h"
 #include "content/public/common/console_message_level.h"
 #include "content/public/common/javascript_message_type.h"
@@ -659,6 +660,7 @@ class CONTENT_EXPORT RenderFrameImpl
   FRIEND_TEST_ALL_PREFIXES(ExternalPopupMenuTest, ShowPopupThenNavigate);
   FRIEND_TEST_ALL_PREFIXES(RendererAccessibilityTest,
                            AccessibilityMessagesQueueWhileSwappedOut);
+  FRIEND_TEST_ALL_PREFIXES(RenderFrameImplTest, ZoomLimit);
 
   // A wrapper class used as the callback for JavaScript executed
   // in an isolated world.
@@ -981,6 +983,8 @@ class CONTENT_EXPORT RenderFrameImpl
 
   void InitializeBlameContext(RenderFrameImpl* parent_frame);
 
+  void OnGotZoomLevel(const GURL& url, double zoom_level);
+
   // Stores the WebLocalFrame we are associated with.  This is null from the
   // constructor until BindToWebFrame is called, and it is null after
   // frameDetached is called until destruction (which is asynchronous in the
@@ -1180,6 +1184,9 @@ class CONTENT_EXPORT RenderFrameImpl
 
   std::unique_ptr<blink::WebBluetooth> bluetooth_;
 
+  HostZoomLevels host_zoom_levels_;
+  mojom::HostZoomLevelPtr host_zoom_level_;

[wjmaclean, 2016/05/16 18:53:07]

nit: these names are *very* similar and might be confusing to someone reading
the code ... maybe make host_zoom_levels_ something less similar?

[scottmg, 2016/05/16 22:54:56]

How about host_zoom_levels_ and mojo_host_zoom_level_? Not great...

+
   // Manages play, pause notifications for WebMediaPlayer implementations; its
   // lifetime is tied to the RenderFrame via the RenderFrameObserver interface.
   media::RendererWebMediaPlayerDelegate* media_player_delegate_;