Make VibrationMessageFilter available to other platforms.

content/public/browser/content_browser_client.h

Index: content/public/browser/content_browser_client.h
diff --git a/content/public/browser/content_browser_client.h b/content/public/browser/content_browser_client.h
index 87079c1f60485bae679153fff5ba3319a4ebc816..9e49c64dfbd866c791d7732773680c61830c82a0 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -94,6 +94,7 @@ class RenderViewHostDelegateView;
 class ResourceContext;
 class SiteInstance;
 class SpeechRecognitionManagerDelegate;
+class VibrationProvider;
 class WebContents;
 class WebContentsViewDelegate;
 class WebContentsViewPort;
@@ -571,6 +572,10 @@ class CONTENT_EXPORT ContentBrowserClient {
   // Return NULL to use the default one for the platform to be created.
   virtual LocationProvider* OverrideSystemLocationProvider();
 
+  // Allows an embedder to return its own VibrationProvider implementation.
+  // Return NULL to use the default one for the platform to be created.
+  virtual VibrationProvider* OverrideVibrationProvider();
+
 #if defined(OS_POSIX) && !defined(OS_MACOSX)
   // Populates |mappings| with all files that need to be mapped before launching
   // a child process.