PageLoadMetrics renderer and browser implementation.

content/browser/frame_host/navigation_handle_impl.cc

Index: content/browser/frame_host/navigation_handle_impl.cc
diff --git a/content/browser/frame_host/navigation_handle_impl.cc b/content/browser/frame_host/navigation_handle_impl.cc
index f24999058b5f36021c507f91087d45f01b5435a8..929c5e9ef27147de56819025425889603f7d15d3 100644
--- a/content/browser/frame_host/navigation_handle_impl.cc
+++ b/content/browser/frame_host/navigation_handle_impl.cc
@@ -25,6 +25,7 @@ NavigationHandleImpl::NavigationHandleImpl(const GURL& url,
       net_error_code_(net::OK),
       state_(DID_START),
       is_main_frame_(is_main_frame),
+      is_same_page_(false),
       is_transferring_(false),
       delegate_(delegate) {
   delegate_->DidStartNavigation(this);
@@ -46,6 +47,10 @@ bool NavigationHandleImpl::IsInMainFrame() const {
   return is_main_frame_;
 }
 
+bool NavigationHandleImpl::IsSamePage() const {

[clamy, 2015/09/08 13:25:58]

Add:
CHECK(state_ == DID_COMMIT || state_ == DID_COMMIT_ERROR_PAGE)
    << "This accessor should not be called before the navigation has committed."
This will reduce the risk of embedders getting wrong data.

[Charlie Harrison, 2015/09/08 23:05:15]

Done.

+  return is_same_page_;
+}
+
 bool NavigationHandleImpl::HasCommittedDocument() const {
   return state_ == DID_COMMIT;
 }