Add GL_CHROMIUM_framebuffer_multisample support to Chromium's

WebGraphicsContext3D implementations. (The
GL_EXT_framebuffer_multisample and GL_ANGLE_framebuffer_multisample
extensions are advertised in Chrome's command buffer implementation as
GL_CHROMIUM_framebuffer_multisample.)

Tested manually in WebKit with accelerated 2D canvas with
multisampling turned on. This must land before the associated WebKit
patch.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/6369016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@72596 0039d316-1c4b-4281-b951-d872f2087c98

chrome/renderer/webgraphicscontext3d_command_buffer_impl.cc

@@ -387,6 +387,23 @@ void WebGraphicsContext3DCommandBufferImpl::requestExtensionCHROMIUM(
   glRequestExtensionCHROMIUM(extension);
 }
 
+void WebGraphicsContext3DCommandBufferImpl::blitFramebufferCHROMIUM(
+    int srcX0, int srcY0, int srcX1, int srcY1,
+    int dstX0, int dstY0, int dstX1, int dstY1,
+    unsigned mask, unsigned filter) {
+  glBlitFramebufferEXT(srcX0, srcY0, srcX1, srcY1,
+                       dstX0, dstY0, dstX1, dstY1,
+                       mask, filter);
+}
+
+void WebGraphicsContext3DCommandBufferImpl::
+    renderbufferStorageMultisampleCHROMIUM(
+        unsigned long target, int samples, unsigned internalformat,
+        unsigned width, unsigned height) {
+  glRenderbufferStorageMultisampleEXT(target, samples, internalformat,
+                                      width, height);
+}
+
 // Helper macros to reduce the amount of code.
 
 #define DELEGATE_TO_GL(name, glname)                                    \

chrome/renderer/webgraphicscontext3d_command_buffer_impl.h

@@ -364,6 +364,14 @@ class WebGraphicsContext3DCommandBufferImpl
   virtual WebKit::WebString getRequestableExtensionsCHROMIUM();
   virtual void requestExtensionCHROMIUM(const char*);
 
+  virtual void blitFramebufferCHROMIUM(
+      int srcX0, int srcY0, int srcX1, int srcY1,
+      int dstX0, int dstY0, int dstX1, int dstY1,
+      unsigned mask, unsigned filter);
+  virtual void renderbufferStorageMultisampleCHROMIUM(
+      unsigned long target, int samples, unsigned internalformat,
+      unsigned width, unsigned height);
+
   virtual unsigned createCompositorTexture(unsigned width, unsigned height);
   virtual void deleteCompositorTexture(unsigned parent_texture);
   virtual void copyTextureToCompositor(unsigned texture,

webkit/gpu/webgraphicscontext3d_in_process_impl.cc

@@ -672,6 +672,17 @@ WebString WebGraphicsContext3DInProcessImpl::
 void WebGraphicsContext3DInProcessImpl::requestExtensionCHROMIUM(const char*) {
 }
 
+void WebGraphicsContext3DInProcessImpl::blitFramebufferCHROMIUM(
+    int srcX0, int srcY0, int srcX1, int srcY1,
+    int dstX0, int dstY0, int dstX1, int dstY1,
+    unsigned mask, unsigned filter) {
+}
+
+void WebGraphicsContext3DInProcessImpl::renderbufferStorageMultisampleCHROMIUM(
+    unsigned long target, int samples, unsigned internalformat,
+    unsigned width, unsigned height) {
+}
+
 // Helper macros to reduce the amount of code.
 
 #define DELEGATE_TO_GL(name, glname)                                           \

webkit/gpu/webgraphicscontext3d_in_process_impl.h

@@ -75,6 +75,14 @@ class WebGraphicsContext3DInProcessImpl : public WebKit::WebGraphicsContext3D {
   virtual WebKit::WebString getRequestableExtensionsCHROMIUM();
   virtual void requestExtensionCHROMIUM(const char*);
 
+  virtual void blitFramebufferCHROMIUM(
+      int srcX0, int srcY0, int srcX1, int srcY1,
+      int dstX0, int dstY0, int dstX1, int dstY1,
+      unsigned mask, unsigned filter);
+  virtual void renderbufferStorageMultisampleCHROMIUM(
+      unsigned long target, int samples, unsigned internalformat,
+      unsigned width, unsigned height);
+
   virtual void activeTexture(unsigned long texture);
   virtual void attachShader(WebKit::WebGLId program, WebKit::WebGLId shader);
   virtual void bindAttribLocation(