Snap RWHVA and resize the legacy window on Windows whenever the ancestor window's bounds change.

content/browser/renderer_host/render_widget_host_view_aura.h

Index: content/browser/renderer_host/render_widget_host_view_aura.h
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.h b/content/browser/renderer_host/render_widget_host_view_aura.h
index 89bead7ba5d890cf2c78985745ee68f3cef02191..add0e30d1c4cd0ca2b7825ee3479f212ade40876 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.h
+++ b/content/browser/renderer_host/render_widget_host_view_aura.h
@@ -398,9 +398,6 @@ class CONTENT_EXPORT RenderWidgetHostViewAura
   FRIEND_TEST_ALL_PREFIXES(WebContentsViewAuraTest,
                            WebContentsViewReparent);
 
-  class WindowObserver;
-  friend class WindowObserver;
-
   void UpdateCursorIfOverSelf();
 
   // Tracks whether SnapToPhysicalPixelBoundary() has been called.
@@ -500,6 +497,9 @@ class CONTENT_EXPORT RenderWidgetHostViewAura
                               bool mouse_locked,
                               bool selection_popup);
 
+  // Called when the parent window bounds change.
+  void HandleParentBoundsChanged();
+
   // The model object.
   RenderWidgetHostImpl* host_;
 
@@ -507,8 +507,17 @@ class CONTENT_EXPORT RenderWidgetHostViewAura
 
   scoped_ptr<DelegatedFrameHost> delegated_frame_host_;
 
+  class WindowObserver;

[sky, 2015/04/09 23:44:38]

nit: I believe we try and group class and friend declarations at the beginning
of a section.

[ananta, 2015/04/10 00:36:52]

Moved back to where it was before. I thought it would be better to have it where
it was needed.

+  friend class WindowObserver;
+
+  class WindowAncestorObserver;
+  friend class WindowAncestorObserver;
+
   scoped_ptr<WindowObserver> window_observer_;
 
+  // Tracks the ancestors of the RWHVA window for bounds changed notifications.

[sky, 2015/04/09 23:44:38]

nit: it isn't bounds change, rather screen bounds changing.

[ananta, 2015/04/10 00:36:52]

Reworded.

+  scoped_ptr<WindowAncestorObserver> ancestor_window_observer_;
+
   // Are we in the process of closing?  Tracked so fullscreen views can avoid
   // sending a second shutdown request to the host when they lose the focus
   // after requesting shutdown for another reason (e.g. Escape key).