Add a mechanism to pause and resume geolocation requests.

content/browser/renderer_host/render_view_host_impl.h

Index: content/browser/renderer_host/render_view_host_impl.h
diff --git a/content/browser/renderer_host/render_view_host_impl.h b/content/browser/renderer_host/render_view_host_impl.h
index c6d6016c15d7d795e7653c5e623711ce7fa03f3d..888b8d55f22fae351146874bf197a19dc68786e5 100644
--- a/content/browser/renderer_host/render_view_host_impl.h
+++ b/content/browser/renderer_host/render_view_host_impl.h
@@ -496,6 +496,10 @@ class CONTENT_EXPORT RenderViewHostImpl
                                          bool main_frame,
                                          const GURL& url);
 
+  // Pause or resume geolocation callbacks. Can be called on any thread.
+  virtual void PauseGeolocation();
+  virtual void ResumeGeolocation();
+
   // NOTE: Do not add functions that just send an IPC message that are called in
   // one or two places. Have the caller send the IPC message directly (unless
   // the caller places are in different platforms, in which case it's better