Implemented support for GL constext share groups in the renderer process.

content/renderer/gpu/renderer_gl_context.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.
 
 // This API is consistent with other OpenGL setup APIs like window's WGL
 // and pepper's PGL. This API is used to manage OpenGL RendererGLContexts in the
 // Chrome renderer process in a way that is consistent with other platforms.
 
 #ifndef CONTENT_RENDERER_GPU_RENDERER_GL_CONTEXT_H_
 #define CONTENT_RENDERER_GPU_RENDERER_GL_CONTEXT_H_
@@ skipping 82 matching lines @@
   // allocate both fake PluginWindowHandles and NativeViewIds and map
   // from fake NativeViewIds to PluginWindowHandles, but this seems like
   // unnecessary complexity at the moment.
   //
   // The render_view_id is currently also only used on Mac OS X.
   // TODO(kbr): clean up the arguments to this function and make them
   // more cross-platform.
   static RendererGLContext* CreateViewContext(
       GpuChannelHost* channel,
       int render_view_id,
+      RendererGLContext* share_group,
       const char* allowed_extensions,
       const int32* attrib_list,
       const GURL& active_arl);
 
 #if defined(OS_MACOSX)
   // On Mac OS X only, view RendererGLContexts actually behave like offscreen
   // RendererGLContexts, and require an explicit resize operation which is
   // slightly different from that of offscreen RendererGLContexts.
   void ResizeOnscreen(const gfx::Size& size);
 #endif
 
   // Create a RendererGLContext that renders to an offscreen frame buffer. If
   // parent is not NULL, that RendererGLContext can access a copy of the created
   // RendererGLContext's frame buffer that is updated every time SwapBuffers is
   // called. It is not as general as shared RendererGLContexts in other
   // implementations of OpenGL. If parent is not NULL, it must be used on the
   // same thread as the parent. A child RendererGLContext may not outlive its
   // parent.  attrib_list must be NULL or a NONE-terminated list of
   // attribute/value pairs.
   static RendererGLContext* CreateOffscreenContext(
       GpuChannelHost* channel,
       const gfx::Size& size,
+      RendererGLContext* share_group,
       const char* allowed_extensions,
       const int32* attrib_list,
       const GURL& active_url);
 
   // Sets the parent context. If any parent textures have been created for
   // another parent, it is important to delete them before changing the parent.
   bool SetParent(RendererGLContext* parent);
 
   // Resize an offscreen frame buffer. The resize occurs on the next call to
   // SwapBuffers. This is to avoid waiting until all pending GL calls have been
@@ skipping 47 matching lines @@
   bool IsCommandBufferContextLost();
 
   CommandBufferProxy* GetCommandBufferProxy();
 
  private:
   explicit RendererGLContext(GpuChannelHost* channel);
 
   bool Initialize(bool onscreen,
                   int render_view_id,
                   const gfx::Size& size,
+                  RendererGLContext* share_group,
                   const char* allowed_extensions,
                   const int32* attrib_list,
                   const GURL& active_url);
   void Destroy();
 
   void OnSwapBuffers();
   void OnContextLost();
 
   scoped_refptr<GpuChannelHost> channel_;
   base::WeakPtr<RendererGLContext> parent_;
   scoped_ptr<Callback0::Type> swap_buffers_callback_;
   scoped_ptr<Callback1<ContextLostReason>::Type> context_lost_callback_;
   uint32 parent_texture_id_;
   CommandBufferProxy* command_buffer_;
   gpu::gles2::GLES2CmdHelper* gles2_helper_;
   int32 transfer_buffer_id_;
   gpu::gles2::GLES2Implementation* gles2_implementation_;
   gfx::Size size_;
   Error last_error_;
   int frame_number_;
 
   DISALLOW_COPY_AND_ASSIGN(RendererGLContext);
 };
 
 #endif  // CONTENT_RENDERER_GPU_RENDERER_GL_CONTEXT_H_