cc: Add frame timing request plumbing through the layers.

cc/debug/frame_timing_request.cc

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "cc/debug/frame_timing_request.h"
+
+namespace cc {
+
+FrameTimingRequest::FrameTimingRequest() : id_(0) {
+}
+
+FrameTimingRequest::FrameTimingRequest(int64_t request_id,
+                                       const gfx::Rect& rect)
+    : id_(request_id), rect_(rect) {
+}
+
+}  // namespace cc