Revamp OffscreenCanvas commit flow

third_party/WebKit/Source/platform/graphics/OffscreenCanvasFrameDispatcherImpl.cpp

 // Copyright 2016 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 "platform/graphics/OffscreenCanvasFrameDispatcherImpl.h"
 
 #include "cc/output/compositor_frame.h"
 #include "cc/quads/texture_draw_quad.h"
 #include "gpu/command_buffer/client/gles2_interface.h"
 #include "platform/CrossThreadFunctional.h"
@@ skipping 12 matching lines @@
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/transform.h"
 #include "wtf/typed_arrays/ArrayBuffer.h"
 #include "wtf/typed_arrays/Uint8Array.h"
 
 namespace blink {
 
 OffscreenCanvasFrameDispatcherImpl::OffscreenCanvasFrameDispatcherImpl(
     uint32_t clientId,
     uint32_t sinkId,
-    uint32_t localId,
-    uint64_t nonceHigh,
-    uint64_t nonceLow,
     int canvasId,
     int width,
     int height)
     : m_frameSinkId(cc::FrameSinkId(clientId, sinkId)),
-      m_currentLocalFrameId(cc::LocalFrameId(
-          localId,
-          base::UnguessableToken::Deserialize(nonceHigh, nonceLow))),
       m_width(width),
       m_height(height),
       m_nextResourceId(1u),
       m_binding(this),
       m_placeholderCanvasId(canvasId) {
+  m_currentLocalFrameId = m_surfaceIdAllocator.GenerateId();
   DCHECK(!m_sink.is_bound());
   mojom::blink::OffscreenCanvasCompositorFrameSinkProviderPtr provider;
   Platform::current()->interfaceProvider()->getInterface(
       mojo::GetProxy(&provider));
-  cc::SurfaceId surfaceId(m_frameSinkId, m_currentLocalFrameId);
-  provider->CreateCompositorFrameSink(surfaceId,
+  provider->CreateCompositorFrameSink(m_frameSinkId,
                                       m_binding.CreateInterfacePtrAndBind(),
                                       mojo::GetProxy(&m_sink));
 }
 
 void OffscreenCanvasFrameDispatcherImpl::setTransferableResourceToSharedBitmap(
     cc::TransferableResource& resource,
     RefPtr<StaticBitmapImage> image) {
   std::unique_ptr<cc::SharedBitmap> bitmap =
       Platform::current()->allocateSharedBitmap(IntSize(m_width, m_height));
   if (!bitmap)
@@ skipping 346 matching lines @@
     return true;
   return false;
 }
 
 void OffscreenCanvasFrameDispatcherImpl::reshape(int width, int height) {
   m_width = width;
   m_height = height;
 }
 
 }  // namespace blink