cc: Make separate interface for BeginFrame ipc from OutputSurface

content/browser/android/in_process/synchronous_compositor_external_begin_frame_source.cc

Index: content/browser/android/in_process/synchronous_compositor_external_begin_frame_source.cc
diff --git a/content/browser/android/in_process/synchronous_compositor_external_begin_frame_source.cc b/content/browser/android/in_process/synchronous_compositor_external_begin_frame_source.cc
new file mode 100644
index 0000000000000000000000000000000000000000..7ce148250752416b2d1f8c11fe19295d620a0f8d
--- /dev/null
+++ b/content/browser/android/in_process/synchronous_compositor_external_begin_frame_source.cc
@@ -0,0 +1,59 @@
+// Copyright 2014 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 "content/browser/android/in_process/synchronous_compositor_external_begin_frame_source.h"
+
+#include "cc/output/begin_frame_args.h"
+#include "content/browser/android/in_process/synchronous_compositor_impl.h"
+#include "content/public/browser/browser_thread.h"
+
+namespace content {
+
+SynchronousCompositorExternalBeginFrameSource::
+    SynchronousCompositorExternalBeginFrameSource(int routing_id)
+    : routing_id_(routing_id),
+      compositor_(nullptr) {
+}
+
+SynchronousCompositorExternalBeginFrameSource::
+    ~SynchronousCompositorExternalBeginFrameSource() {
+  DCHECK(CalledOnValidThread());
+  if (compositor_)
+    compositor_->SetExternalBeginFrameSource(nullptr);
+}
+
+void SynchronousCompositorExternalBeginFrameSource::BeginFrame() {
+  DCHECK(CalledOnValidThread());
+  CallOnBeginFrame(cc::BeginFrameArgs::CreateForSynchronousCompositor());
+}
+
+void SynchronousCompositorExternalBeginFrameSource::SetNeedsBeginFrames(
+    bool needs_begin_frames) {
+  DCHECK(CalledOnValidThread());
+  DCHECK(compositor_);
+
+  BeginFrameSourceMixIn::SetNeedsBeginFrames(needs_begin_frames);
+
+  if (!compositor_->invoking_composite())
+    compositor_->SetContinuousInvalidate(needs_begin_frames);
+}
+
+void SynchronousCompositorExternalBeginFrameSource::SetClientReady() {
+  DCHECK(CalledOnValidThread());
+  DCHECK(!compositor_);
+
+  compositor_ = SynchronousCompositorImpl::FromRoutingID(routing_id_);
+  DCHECK(compositor_);
+  compositor_->SetExternalBeginFrameSource(this);
+}
+
+// Not using base::NonThreadSafe as we want to enforce a more exacting threading
+// requirement: SynchronousCompositorExternalBeginFrameSource() must only be
+// used on the UI thread.
+bool
+SynchronousCompositorExternalBeginFrameSource::CalledOnValidThread() const {
+  return BrowserThread::CurrentlyOn(BrowserThread::UI);
+}
+
+}  // namespace content