Add support for ES3 MSAA.

src/gpu/gl/GrGLInterface.cpp

Index: src/gpu/gl/GrGLInterface.cpp
===================================================================
--- src/gpu/gl/GrGLInterface.cpp	(revision 10891)
+++ src/gpu/gl/GrGLInterface.cpp	(working copy)
@@ -324,25 +324,45 @@
             }
         }
     } else {
+#if GR_GL_IGNORE_ES3_MSAA

[robertphillips, 2013/08/23 17:25:34]

can we share the second two if blocks between the two cases?

[bsalomon, 2013/08/23 17:28:49]

I think not, see responses below. The plan is to delete this whole #if block
once Chrome is updated.

         if (extensions.has("GL_CHROMIUM_framebuffer_multisample")) {
             if (NULL == fRenderbufferStorageMultisample ||
                 NULL == fBlitFramebuffer) {
                 return false;
             }
+        } else if (extensions.has("GL_APPLE_framebuffer_multisample")) {

[robertphillips, 2013/08/23 17:25:34]

why not fRenderbufferStorageMultisampleES2APPLE?

[bsalomon, 2013/08/23 17:28:49]

That doesn't exist when GR_GL_IGNORE_ES3_MSAA is true

+            if (NULL == fRenderbufferStorageMultisample ||
+                NULL == fResolveMultisampleFramebuffer) {
+                return false;
+            }
+        } else if (extensions.has("GL_IMG_multisampled_render_to_texture") ||
+                   extensions.has("GL_EXT_multisampled_render_to_texture")) {

[robertphillips, 2013/08/23 17:25:34]

why not fRenderbufferStorageMultisampleES2EXT?

[bsalomon, 2013/08/23 17:28:49]

ditto

+            if (NULL == fRenderbufferStorageMultisample ||
+                NULL == fFramebufferTexture2DMultisample) {
+                return false;
+            }
         }
+#else
+        if (glVer >= GR_GL_VER(3,0) || extensions.has("GL_CHROMIUM_framebuffer_multisample")) {
+            if (NULL == fRenderbufferStorageMultisample ||
+                NULL == fBlitFramebuffer) {
+                return false;
+            }
+        }
         if (extensions.has("GL_APPLE_framebuffer_multisample")) {
-            if (NULL == fRenderbufferStorageMultisample ||
+            if (NULL == fRenderbufferStorageMultisampleES2APPLE ||
                 NULL == fResolveMultisampleFramebuffer) {
                 return false;
             }
         }
         if (extensions.has("GL_IMG_multisampled_render_to_texture") ||
             extensions.has("GL_EXT_multisampled_render_to_texture")) {
-            if (NULL == fRenderbufferStorageMultisample ||
+            if (NULL == fRenderbufferStorageMultisampleES2EXT ||
                 NULL == fFramebufferTexture2DMultisample) {
                 return false;
             }
         }
+#endif
     }
 
     // On ES buffer mapping is an extension. On Desktop