Add chromium side implementation of WebKit::WebCrypto.

content/renderer/renderer_webkitplatformsupport_impl.h

Index: content/renderer/renderer_webkitplatformsupport_impl.h
diff --git a/content/renderer/renderer_webkitplatformsupport_impl.h b/content/renderer/renderer_webkitplatformsupport_impl.h
index 7f096e5d20bbc1bc499e88bcd15d0dd4d1571770..7919defcc3fb4c54d9d9b049046ee1810c16389d 100644
--- a/content/renderer/renderer_webkitplatformsupport_impl.h
+++ b/content/renderer/renderer_webkitplatformsupport_impl.h
@@ -37,6 +37,7 @@ class GamepadSharedMemoryReader;
 class RendererClipboardClient;
 class ThreadSafeSender;
 class WebClipboardImpl;
+class WebCryptoImpl;
 class WebFileSystemImpl;
 class WebSharedWorkerRepositoryImpl;
 
@@ -138,6 +139,7 @@ class CONTENT_EXPORT RendererWebKitPlatformSupportImpl
       const WebKit::WebString& host, const WebKit::WebString& languages);
   virtual void setDeviceMotionListener(
       WebKit::WebDeviceMotionListener* listener) OVERRIDE;
+  virtual WebKit::WebCrypto* crypto() OVERRIDE;
 
   // Disables the WebSandboxSupport implementation for testing.
   // Tests that do not set up a full sandbox environment should call
@@ -199,6 +201,8 @@ class CONTENT_EXPORT RendererWebKitPlatformSupportImpl
   scoped_refptr<cc::ContextProvider> shared_offscreen_context_;
 
   webkit::WebCompositorSupportImpl compositor_support_;
+
+  scoped_ptr<WebCryptoImpl> web_crypto_;
 };
 
 }  // namespace content