cc: Track BeginMainFrame more precisely in CompositorTimingHistory.

cc/trees/threaded_channel.cc

Index: cc/trees/threaded_channel.cc
diff --git a/cc/trees/threaded_channel.cc b/cc/trees/threaded_channel.cc
index 5c0cb6f66120db94923f9ba66f6f4ae981a1b59c..4c3bccfb0ed9ea1d892f227a19cea6b75025a535 100644
--- a/cc/trees/threaded_channel.cc
+++ b/cc/trees/threaded_channel.cc
@@ -80,10 +80,13 @@ void ThreadedChannel::SetNeedsCommitOnImpl() {
                                               proxy_impl_->GetImplWeakPtr()));
 }
 
-void ThreadedChannel::BeginMainFrameAbortedOnImpl(CommitEarlyOutReason reason) {
+void ThreadedChannel::BeginMainFrameAbortedOnImpl(
+    CommitEarlyOutReason reason,
+    base::TimeTicks main_thread_start_time) {
   ImplThreadTaskRunner()->PostTask(
       FROM_HERE, base::Bind(&ProxyImpl::BeginMainFrameAbortedOnImpl,
-                            proxy_impl_->GetImplWeakPtr(), reason));
+                            proxy_impl_->GetImplWeakPtr(), reason,
+                            main_thread_start_time));
 }
 
 void ThreadedChannel::SetNeedsRedrawOnImpl(const gfx::Rect& damage_rect) {
@@ -92,10 +95,13 @@ void ThreadedChannel::SetNeedsRedrawOnImpl(const gfx::Rect& damage_rect) {
                             proxy_impl_->GetImplWeakPtr(), damage_rect));
 }
 
-void ThreadedChannel::StartCommitOnImpl(CompletionEvent* completion) {
+void ThreadedChannel::StartCommitOnImpl(
+    CompletionEvent* completion,
+    base::TimeTicks main_thread_start_time) {
   ImplThreadTaskRunner()->PostTask(
-      FROM_HERE, base::Bind(&ProxyImpl::StartCommitOnImpl,
-                            proxy_impl_->GetImplWeakPtr(), completion));
+      FROM_HERE,
+      base::Bind(&ProxyImpl::StartCommitOnImpl, proxy_impl_->GetImplWeakPtr(),
+                 completion, main_thread_start_time));
 }
 
 void ThreadedChannel::SetVisibleOnImpl(CompletionEvent* completion,