cc: Route offscreen context creation for compositor to the browser.

webkit/compositor_bindings/web_layer_tree_view_impl.cc

Index: webkit/compositor_bindings/web_layer_tree_view_impl.cc
diff --git a/webkit/compositor_bindings/web_layer_tree_view_impl.cc b/webkit/compositor_bindings/web_layer_tree_view_impl.cc
index dba117c88ac00bc2e40cca90f63d154ffc1856a6..848254958d2d3f279ef211750d8ff6fc4b7b7d21 100644
--- a/webkit/compositor_bindings/web_layer_tree_view_impl.cc
+++ b/webkit/compositor_bindings/web_layer_tree_view_impl.cc
@@ -6,6 +6,8 @@
 
 #include "base/command_line.h"
 #include "base/string_number_conversions.h"
+#include "base/synchronization/lock.h"
+#include "cc/context_provider.h"
 #include "cc/input_handler.h"
 #include "cc/layer.h"
 #include "cc/layer_tree_host.h"
@@ -16,6 +18,7 @@
 #include "third_party/WebKit/Source/Platform/chromium/public/WebLayerTreeViewClient.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebLayerTreeView.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebRenderingStats.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebSharedGraphicsContext3D.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebSize.h"
 #include "web_layer_impl.h"
 #include "web_to_ccinput_handler_adapter.h"
@@ -283,4 +286,74 @@ void WebLayerTreeViewImpl::scheduleComposite()
     m_client->scheduleComposite();
 }
 
+class WebLayerTreeViewImpl::MainThreadContextProvider : public cc::ContextProvider {
+ public:
+  virtual bool InitializeOnMainThread() OVERRIDE { return true; }
+  virtual bool BindToCurrentThread() OVERRIDE { return true; }
+
+  virtual WebKit::WebGraphicsContext3D* Context3d() OVERRIDE {
+    return WebSharedGraphicsContext3D::mainThreadContext();
+  }
+  virtual class GrContext* GrContext() OVERRIDE {
+    return WebSharedGraphicsContext3D::mainThreadGrContext();
+  }
+
+  virtual void VerifyContexts() OVERRIDE {}
+
+ protected:
+  virtual ~MainThreadContextProvider() {}
+};
+
+scoped_refptr<cc::ContextProvider> WebLayerTreeViewImpl::OffscreenContextProviderForMainThread() {
+  if (!m_contextsMainThread)
+    m_contextsMainThread = new MainThreadContextProvider;
+  return m_contextsMainThread;
+}
+
+class WebLayerTreeViewImpl::CompositorThreadContextProvider
+    : public cc::ContextProvider {
+ public:
+  CompositorThreadContextProvider() : destroyed_(false) {}
+
+  virtual bool InitializeOnMainThread() OVERRIDE {
+    return WebSharedGraphicsContext3D::createCompositorThreadContext();
+  }
+  virtual bool BindToCurrentThread() OVERRIDE {
+    return Context3d()->makeContextCurrent();
+  }
+
+  virtual WebKit::WebGraphicsContext3D* Context3d() OVERRIDE {
+    return WebSharedGraphicsContext3D::compositorThreadContext();
+  }
+  virtual class GrContext* GrContext() OVERRIDE {
+    return WebSharedGraphicsContext3D::compositorThreadGrContext();
+  }
+
+  virtual void VerifyContexts() OVERRIDE {
+    if (Context3d() && !Context3d()->isContextLost())
+      return;
+    base::AutoLock lock(destroyed_lock_);
+    destroyed_ = true;
+  }
+  bool DestroyedOnMainThread() {
+    base::AutoLock lock(destroyed_lock_);
+    return destroyed_;
+  }
+
+ protected:
+  virtual ~CompositorThreadContextProvider() {}
+
+ private:
+  base::Lock destroyed_lock_;
+  bool destroyed_;
+};
+
+scoped_refptr<cc::ContextProvider> WebLayerTreeViewImpl::OffscreenContextProviderForCompositorThread() {
+  if (!m_contextsCompositorThread ||
+      m_contextsCompositorThread->DestroyedOnMainThread()) {
+    m_contextsCompositorThread = new CompositorThreadContextProvider;
+  }
+  return m_contextsCompositorThread;
+}
+
 } // namespace WebKit