Notify the change of brand color from renderer to Brower

content/public/browser/web_contents_observer.h

Index: content/public/browser/web_contents_observer.h
diff --git a/content/public/browser/web_contents_observer.h b/content/public/browser/web_contents_observer.h
index 4f600acd5804c5cf37b59777475a8c21a56991b4..fb8833ac58388cd1ce515b5f7f97dff1244b2944 100644
--- a/content/public/browser/web_contents_observer.h
+++ b/content/public/browser/web_contents_observer.h
@@ -328,6 +328,10 @@ class CONTENT_EXPORT WebContentsObserver : public IPC::Listener,
   virtual void AccessibilityEventReceived(
       const std::vector<AXEventNotificationDetails>& details) {}
 
+  // Invoked when brand color changed, |brand_color| is the new color with RGBA
+  // format.
+  virtual void DidChangeBrandColor(uint32 brand_color) {}
+
   // Invoked if an IPC message is coming from a specific RenderFrameHost.
   virtual bool OnMessageReceived(const IPC::Message& message,
                                  RenderFrameHost* render_frame_host);