Add a JS API for detecting WebGL availability.

chrome/browser/extensions/extension_webstore_private_api.h

 // Copyright (c) 2011 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_WEBSTORE_PRIVATE_API_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_WEBSTORE_PRIVATE_API_H_
 #pragma once
 
 #include <string>
 
 #include "chrome/browser/extensions/extension_function.h"
 #include "chrome/browser/extensions/extension_install_ui.h"
 #include "chrome/browser/extensions/webstore_install_helper.h"
 #include "chrome/browser/extensions/webstore_installer.h"
 #include "chrome/common/net/gaia/google_service_auth_error.h"
+#include "content/browser/gpu/gpu_data_manager.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
 class ProfileSyncService;
 
 class WebstorePrivateApi {
  public:
   // Allows you to set the ProfileSyncService the function will use for
   // testing purposes.
   static void SetTestingProfileSyncService(ProfileSyncService* service);
@@ skipping 126 matching lines @@
 class GetStoreLoginFunction : public SyncExtensionFunction {
   virtual bool RunImpl() OVERRIDE;
   DECLARE_EXTENSION_FUNCTION_NAME("webstorePrivate.getStoreLogin");
 };
 
 class SetStoreLoginFunction : public SyncExtensionFunction {
   virtual bool RunImpl() OVERRIDE;
   DECLARE_EXTENSION_FUNCTION_NAME("webstorePrivate.setStoreLogin");
 };
 
+class GetWebGLStatusFunction : public AsyncExtensionFunction,
+                               public GpuDataManager::Observer {
+ public:
+  GetWebGLStatusFunction();
+
+  // Implementing GpuDataManager::Observer interface.
+  virtual void OnGpuInfoUpdate() OVERRIDE;
+
+ protected:
+  virtual ~GetWebGLStatusFunction();
+  virtual bool RunImpl() OVERRIDE;
+
+ private:
+  void CreateResult(bool webgl_allowed);
+
+  // A false return value is always valid, but a true one is only valid if full
+  // GPU info has been collected in a GPU process.
+  static bool IsWebGLAllowed(GpuDataManager* manager);
+
+  DECLARE_EXTENSION_FUNCTION_NAME("webstorePrivate.getWebGLStatus");
+};
+
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_WEBSTORE_PRIVATE_API_H_