Create default implementations of ContentRendererClient, ContentUtilityClient, and ContentPluginCli…

content/public/renderer/content_renderer_client.h

 // Copyright (c) 2012 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 CONTENT_PUBLIC_RENDERER_CONTENT_RENDERER_CLIENT_H_
 #define CONTENT_PUBLIC_RENDERER_CONTENT_RENDERER_CLIENT_H_
 #pragma once
 
 #include <string>
 
 #include "base/string16.h"
 #include "base/memory/weak_ptr.h"
 #include "ipc/ipc_message.h"
 #include "content/public/common/content_client.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebPageVisibilityState.h"
+#include "v8/include/v8.h"
 
 class FilePath;
 class GURL;
 class SkBitmap;
 
 namespace WebKit {
 class WebAudioSourceProvider;
 class WebFrame;
 class WebMediaPlayerClient;
 class WebPlugin;
@@ skipping 14 matching lines @@
 class MediaLog;
 class MessageLoopFactory;
 }
 
 namespace webkit_media {
 class MediaStreamClient;
 class WebMediaPlayerDelegate;
 class WebMediaPlayerImpl;
 }
 
-namespace v8 {
-class Context;
-template<class T> class Handle;

[tfarina, 2012/05/30 00:10:33]

why not keep these forward declarations? I guess it doesn't hurt. :/ I like them
more than including v8.h in header files.

[jam, 2012/05/30 14:50:21]

I had to include v8.h after I inlined some methods

-}
-
 namespace content {
 
 class RenderView;
 
 // Embedder API for participating in renderer logic.
-class ContentRendererClient {
+class CONTENT_EXPORT ContentRendererClient {
  public:
   virtual ~ContentRendererClient() {}
 
   // Notifies us that the RenderThread has been created.
-  virtual void RenderThreadStarted() = 0;
+  virtual void RenderThreadStarted() {}
 
   // Notifies that a new RenderView has been created.
-  virtual void RenderViewCreated(RenderView* render_view) = 0;
+  virtual void RenderViewCreated(RenderView* render_view) {}
 
   // Sets a number of views/tabs opened in this process.
-  virtual void SetNumberOfViews(int number_of_views) = 0;
+  virtual void SetNumberOfViews(int number_of_views) {}
 
   // Returns the bitmap to show when a plugin crashed, or NULL for none.
-  virtual SkBitmap* GetSadPluginBitmap() = 0;
+  virtual SkBitmap* GetSadPluginBitmap();
 
   // Returns the default text encoding.
-  virtual std::string GetDefaultEncoding() = 0;
+  virtual std::string GetDefaultEncoding();
 
   // Allows the embedder to override creating a plugin. If it returns true, then
   // |plugin| will contain the created plugin, although it could be NULL. If it
   // returns false, the content layer will create the plugin.
   virtual bool OverrideCreatePlugin(
       RenderView* render_view,
       WebKit::WebFrame* frame,
       const WebKit::WebPluginParams& params,
-      WebKit::WebPlugin** plugin) = 0;
+      WebKit::WebPlugin** plugin);
 
   // Creates a replacement plug-in that is shown when the plug-in at |file_path|
   // couldn't be loaded. This allows the embedder to show a custom placeholder.
   virtual WebKit::WebPlugin* CreatePluginReplacement(
       RenderView* render_view,
-      const FilePath& plugin_path) = 0;
+      const FilePath& plugin_path);
 
   // Returns true if the embedder has an error page to show for the given http
   // status code. If so |error_domain| should be set to according to WebURLError
   // and the embedder's GetNavigationErrorHtml will be called afterwards to get
   // the error html.
   virtual bool HasErrorPage(int http_status_code,
-                            std::string* error_domain) = 0;
+                            std::string* error_domain);
 
   // Returns the information to display when a navigation error occurs.
   // If |error_html| is not null then it may be set to a HTML page containing
   // the details of the error and maybe links to more info.
   // If |error_description| is not null it may be set to contain a brief
   // message describing the error that has occurred.
   // Either of the out parameters may be not written to in certain cases
   // (lack of information on the error code) so the caller should take care to
   // initialize the string values with safe defaults before the call.
   virtual void GetNavigationErrorStrings(
       const WebKit::WebURLRequest& failed_request,
       const WebKit::WebURLError& error,
       std::string* error_html,
-      string16* error_description) = 0;
+      string16* error_description) {}
 
   // Allows embedder to override creating a WebMediaPlayerImpl. If it returns
   // NULL the content layer will create the media player.
   virtual webkit_media::WebMediaPlayerImpl* OverrideCreateWebMediaPlayer(
       RenderView* render_view,
       WebKit::WebFrame* frame,
       WebKit::WebMediaPlayerClient* client,
       base::WeakPtr<webkit_media::WebMediaPlayerDelegate> delegate,
       media::FilterCollection* collection,
       WebKit::WebAudioSourceProvider* audio_source_provider,
       media::MessageLoopFactory* message_loop_factory,
       webkit_media::MediaStreamClient* media_stream_client,
-      media::MediaLog* media_log) = 0;
+      media::MediaLog* media_log);
 
   // Returns true if the renderer process should schedule the idle handler when
   // all widgets are hidden.
-  virtual bool RunIdleHandlerWhenWidgetsHidden() = 0;
+  virtual bool RunIdleHandlerWhenWidgetsHidden();
 
   // Returns true if the given url can create popup windows.
-  virtual bool AllowPopup(const GURL& creator) = 0;
+  virtual bool AllowPopup(const GURL& creator);
 
   // Returns true if we should fork a new process for the given navigation.
   virtual bool ShouldFork(WebKit::WebFrame* frame,
                           const GURL& url,
                           bool is_initial_navigation,
-                          bool* send_referrer) = 0;
+                          bool* send_referrer);
 
   // Notifies the embedder that the given frame is requesting the resource at
   // |url|.  If the function returns true, the url is changed to |new_url|.
   virtual bool WillSendRequest(WebKit::WebFrame* frame,
                                const GURL& url,
-                               GURL* new_url) = 0;
+                               GURL* new_url);
 
   // Whether to pump events when sending sync cookie messages.  Needed if the
   // embedder can potentiall put up a modal dialog on the UI thread as a result.
-  virtual bool ShouldPumpEventsDuringCookieMessage() = 0;
+  virtual bool ShouldPumpEventsDuringCookieMessage();
 
   // See the corresponding functions in WebKit::WebFrameClient.
   virtual void DidCreateScriptContext(WebKit::WebFrame* frame,
                                       v8::Handle<v8::Context> context,
                                       int extension_group,
-                                      int world_id) = 0;
+                                      int world_id) {}
   virtual void WillReleaseScriptContext(WebKit::WebFrame* frame,
                                         v8::Handle<v8::Context>,
-                                        int world_id) = 0;
+                                        int world_id) {}
 
   // See WebKit::WebKitPlatformSupport.
   virtual unsigned long long VisitedLinkHash(const char* canonical_url,
-                                             size_t length) = 0;
-  virtual bool IsLinkVisited(unsigned long long link_hash) = 0;
-  virtual void PrefetchHostName(const char* hostname, size_t length) = 0;
+                                             size_t length);
+  virtual bool IsLinkVisited(unsigned long long link_hash);
+  virtual void PrefetchHostName(const char* hostname, size_t length) {}
   virtual bool ShouldOverridePageVisibilityState(
       const RenderView* render_view,
-      WebKit::WebPageVisibilityState* override_state) const = 0;
+      WebKit::WebPageVisibilityState* override_state) const;
 
   // Return true if the GetCookie request will be handled by the embedder.
   // Cookies are returned in the cookie parameter.
   virtual bool HandleGetCookieRequest(RenderView* sender,
                                       const GURL& url,
                                       const GURL& first_party_for_cookies,
-                                      std::string* cookies) = 0;
+                                      std::string* cookies);
 
   // Return true if the SetCookie request will be handled by the embedder.
   // Cookies to be set are passed in the value parameter.
   virtual bool HandleSetCookieRequest(RenderView* sender,
                                       const GURL& url,
                                       const GURL& first_party_for_cookies,
-                                      const std::string& value) = 0;
+                                      const std::string& value);
 
   virtual void RegisterPPAPIInterfaceFactories(
-    webkit::ppapi::PpapiInterfaceFactoryManager* factory_manager) = 0;
+      webkit::ppapi::PpapiInterfaceFactoryManager* factory_manager) {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_RENDERER_CONTENT_RENDERER_CLIENT_H_