Refactor SynchronousCompositor out of SynchronousCompositorOutputSurface.

content/renderer/android/synchronous_compositor_impl.cc

+// Copyright 2013 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/renderer/android/synchronous_compositor_impl.h"
+
+#include "base/message_loop.h"
+#include "cc/input/input_handler.h"
+#include "content/public/renderer/android/synchronous_compositor_client.h"
+#include "content/public/renderer/content_renderer_client.h"
+
+namespace content {
+
+SynchronousCompositorImpl::SynchronousCompositorImpl(int32 routing_id)
+    : routing_id_(routing_id), compositor_client_(NULL) {}
+
+SynchronousCompositorImpl::~SynchronousCompositorImpl() {
+}
+
+scoped_ptr<cc::OutputSurface>
+SynchronousCompositorImpl::CreateOutputSurface() {
+  scoped_ptr<SynchronousCompositorOutputSurface> output_surface(
+      new SynchronousCompositorOutputSurface(this));
+  output_surface_ = output_surface.get();
+  return output_surface.PassAs<cc::OutputSurface>();
+}
+
+bool SynchronousCompositorImpl::IsHwReady() {
+  DCHECK(CalledOnValidThread());
+  DCHECK(output_surface_);
+
+  if (!output_surface_)
+    return false;

[joth, 2013/05/23 19:20:57]

gracefully handling something you DCHECKed for is antipattern in the style
guide.
As writting the hook-up means it's not possible for the
SynchronousCompositorImpl to exist without a OutputSurface? in which case DCHECK
alone is fine.
if you do want to handle it though, you can log instead of DCEHCK

if (!output_surface) {
  LOG(WARN) 
  return false;
}

+2 more places below

[mkosiba (inactive), 2013/05/24 14:42:41]

Ah, yes, the DCHECK should be sufficient. The a_w layer shouldn't poke at these
methods of the SCI before DidCreateSynchronousCompositor is called.

+  return output_surface_->IsHwReady();
+}
+
+void SynchronousCompositorImpl::SetClient(
+    SynchronousCompositorClient* compositor_client) {
+  DCHECK(CalledOnValidThread());
+  compositor_client_ = compositor_client;
+}
+
+bool SynchronousCompositorImpl::DemandDrawSw(SkCanvas* canvas) {
+  DCHECK(CalledOnValidThread());
+  DCHECK(output_surface_);
+
+  if (!output_surface_)
+    return false;
+
+  return output_surface_->DemandDrawSw(canvas);
+}
+
+bool SynchronousCompositorImpl::DemandDrawHw(
+      gfx::Size view_size,
+      const gfx::Transform& transform,
+      gfx::Rect damage_area) {
+  DCHECK(CalledOnValidThread());
+  DCHECK(output_surface_);
+
+  if (!output_surface_)
+    return false;
+  return output_surface_->DemandDrawHw(view_size, transform, damage_area);
+}
+
+void SynchronousCompositorImpl::SetContinuousInvalidate(bool enable) {
+  DCHECK(CalledOnValidThread());
+  compositor_client_->SetContinuousInvalidate(enable);
+}
+
+void SynchronousCompositorImpl::DidCreateSynchronousCompositor() {
+  DCHECK(CalledOnValidThread());
+  GetContentClient()->renderer()->DidCreateSynchronousCompositor(routing_id_,
+                                                                 this);
+}
+
+void SynchronousCompositorImpl::DidDestroyCompositor() {
+  DCHECK(CalledOnValidThread());
+  output_surface_ = NULL;

[joth, 2013/05/23 19:20:57]

you're not calling compositor_client_->DidDestroyCompositor any more. 
doing here maybe premature?
but doing it in the destructor will be on the wrong thread?

[mkosiba (inactive), 2013/05/24 14:42:41]

simple oversight on my end. Added the call.

+}
+
+// Not using base::NonThreadSafe as we want to enforce a more exacting threading
+// requirement: SynchronousCompositorImpl() must only be used by
+// embedders that supply their own compositor loop via
+// OverrideCompositorMessageLoop().
+bool SynchronousCompositorImpl::CalledOnValidThread() const {
+  return base::MessageLoop::current() && (base::MessageLoop::current() ==
+      GetContentClient()->renderer()->OverrideCompositorMessageLoop());
+}
+
+}  // namespace content