Move LoadProgressTracker to the browser process.

content/browser/frame_host/navigator_delegate.h

Index: content/browser/frame_host/navigator_delegate.h
diff --git a/content/browser/frame_host/navigator_delegate.h b/content/browser/frame_host/navigator_delegate.h
index 369ee8fec1572baf23796010a1c6d15a521a6c56..0d2dae8c217c5dd9f2228f4ec027e1a2129f8494 100644
--- a/content/browser/frame_host/navigator_delegate.h
+++ b/content/browser/frame_host/navigator_delegate.h
@@ -95,6 +95,22 @@ class CONTENT_EXPORT NavigatorDelegate {
       const GURL& url,
       NavigationController::ReloadType reload_type) {}
 
+  // The RenderFrame began loading a new page. This corresponds to Blink's
+  // notion of the throbber starting.
+  // |to_different_document| will be true unless the load is a fragment
+  // navigation, or triggered by history.pushState/replaceState.
+  virtual void DidStartLoading(RenderFrameHostImpl* render_frame_host,
+                               bool to_different_document) {}
+
+  // The RenderFrame stopped loading a page. This corresponds to Blink's notion
+  // of the throbber stopping.
+  virtual void DidStopLoading(RenderFrameHostImpl* render_frame_host) {}
+
+  // The page made progress loading.

[nasko, 2014/05/02 22:48:23]

nit: Why break up the line in the middle, it has lots more space to fit text
from below.

[Avi (use Gerrit), 2014/05/05 15:15:02]

Done.

+  // |progress| is a value between 0 (nothing loaded) to 1.0 (page entirely
+  // loaded).
+  virtual void DidChangeLoadProgress(double progress) {}
+
   // Opens a URL with the given parameters. See PageNavigator::OpenURL, which
   // this forwards to.
   virtual void RequestOpenURL(RenderFrameHostImpl* render_frame_host,