FrameSinkIds use to WindowIds in window server, Process ID/Route ID in renderer

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/output/delegated_frame_data.h"
 #include "cc/quads/render_pass.h"
 #include "cc/quads/shared_quad_state.h"
 #include "cc/quads/solid_color_draw_quad.h"
 #include "cc/quads/texture_draw_quad.h"
 #include "cc/resources/returned_resource.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "public/platform/InterfaceProvider.h"
 #include "public/platform/Platform.h"
 #include "public/platform/modules/offscreencanvas/offscreen_canvas_surface.mojom-blink.h"
 #include "third_party/khronos/GLES2/gl2.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "third_party/skia/include/core/SkImage.h"
 #include "third_party/skia/include/core/SkXfermode.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/transform.h"
 
 namespace blink {
 
 OffscreenCanvasFrameDispatcherImpl::OffscreenCanvasFrameDispatcherImpl(
     uint32_t clientId,
+    uint32_t sinkId,
     uint32_t localId,
     uint64_t nonce,
     int width,
     int height)
-    : m_surfaceId(cc::FrameSinkId(clientId, 0 /* sink_id */), localId, nonce),
+    : m_surfaceId(cc::FrameSinkId(clientId, sinkId), localId, nonce),
       m_width(width),
       m_height(height),
       m_nextResourceId(1u),
       m_binding(this) {
   DCHECK(!m_sink.is_bound());
   mojom::blink::OffscreenCanvasCompositorFrameSinkProviderPtr provider;
   Platform::current()->interfaceProvider()->getInterface(
       mojo::GetProxy(&provider));
   provider->CreateCompositorFrameSink(m_surfaceId,
                                       m_binding.CreateInterfacePtrAndBind(),
@@ skipping 92 matching lines @@
 }
 
 bool OffscreenCanvasFrameDispatcherImpl::verifyImageSize(
     const sk_sp<SkImage>& image) {
   if (image && image->width() == m_width && image->height() == m_height)
     return true;
   return false;
 }
 
 }  // namespace blink