Compositing Layer update for OffscreenCanvas resize

third_party/WebKit/Source/platform/graphics/CanvasSurfaceLayerBridge.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/CanvasSurfaceLayerBridge.h"
 
 #include "cc/layers/surface_layer.h"
 #include "cc/surfaces/surface_id.h"
 #include "cc/surfaces/surface_sequence.h"
 #include "platform/graphics/GraphicsLayer.h"
 #include "platform/mojo/MojoHelper.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebCompositorSupport.h"
 #include "public/platform/WebLayer.h"
 #include "ui/gfx/geometry/size.h"
 #include "wtf/Functional.h"
 
 namespace blink {
 
 CanvasSurfaceLayerBridge::CanvasSurfaceLayerBridge(
     mojom::blink::OffscreenCanvasSurfacePtr service)
-    : m_service(std::move(service)) {}
+    : m_service(std::move(service)), m_binding(this) {}
 
 CanvasSurfaceLayerBridge::~CanvasSurfaceLayerBridge() {}
 
 bool CanvasSurfaceLayerBridge::createSurfaceLayer(int canvasWidth,
                                                   int canvasHeight) {
-  if (!m_service->GetSurfaceId(&m_surfaceId))
+  if (!m_service->GetSurfaceId(m_binding.CreateInterfacePtrAndBind(),
+                               &m_surfaceId))
     return false;
-
-  cc::SurfaceLayer::SatisfyCallback satisfyCallback =
-      convertToBaseCallback(WTF::bind(
-          &CanvasSurfaceLayerBridge::satisfyCallback, WTF::unretained(this)));
-  cc::SurfaceLayer::RequireCallback requireCallback =
-      convertToBaseCallback(WTF::bind(
-          &CanvasSurfaceLayerBridge::requireCallback, WTF::unretained(this)));
-  m_surfaceLayer = cc::SurfaceLayer::Create(std::move(satisfyCallback),
-                                            std::move(requireCallback));
-  m_surfaceLayer->SetSurfaceId(m_surfaceId, 1.f,
-                               gfx::Size(canvasWidth, canvasHeight));
-
+  createNewSurfaceLayer(m_surfaceId, gfx::Size(canvasWidth, canvasHeight));
   m_webLayer = Platform::current()->compositorSupport()->createLayerFromCCLayer(
       m_surfaceLayer.get());
   GraphicsLayer::registerContentsLayer(m_webLayer.get());
+
   return true;
 }
 
 void CanvasSurfaceLayerBridge::satisfyCallback(
     const cc::SurfaceSequence& sequence) {
   m_service->Satisfy(sequence);
 }
 
 void CanvasSurfaceLayerBridge::requireCallback(
     const cc::SurfaceId& surfaceId,
     const cc::SurfaceSequence& sequence) {
   m_service->Require(surfaceId, sequence);
 }
 
+void CanvasSurfaceLayerBridge::OnSurfaceSizeChanged(
+    const cc::SurfaceId& newSurfaceId,
+    uint32_t newWidth,
+    uint32_t newHeight) {
+  if (m_surfaceLayer && m_surfaceLayer->surface_id() != newSurfaceId) {
+    GraphicsLayer::unregisterContentsLayer(m_webLayer.get());
+    createNewSurfaceLayer(newSurfaceId, gfx::Size(newWidth, newHeight));
+    m_webLayer =
+        Platform::current()->compositorSupport()->createLayerFromCCLayer(
+            m_surfaceLayer.get());
+    GraphicsLayer::registerContentsLayer(m_webLayer.get());
+  }
+}
+
+void CanvasSurfaceLayerBridge::createNewSurfaceLayer(
+    const cc::SurfaceId& surfaceId,
+    gfx::Size size) {
+  cc::SurfaceLayer::SatisfyCallback satisfyCallback =
+      convertToBaseCallback(WTF::bind(
+          &CanvasSurfaceLayerBridge::satisfyCallback, WTF::unretained(this)));
+  cc::SurfaceLayer::RequireCallback requireCallback =
+      convertToBaseCallback(WTF::bind(
+          &CanvasSurfaceLayerBridge::requireCallback, WTF::unretained(this)));
+  m_surfaceLayer = cc::SurfaceLayer::Create(std::move(satisfyCallback),
+                                            std::move(requireCallback));
+  m_surfaceLayer->SetSurfaceId(m_surfaceId, 1.f, size);
+}
+
 }  // namespace blink