Blacklist partial swaps on linux

ui/gl/gl_surface.h

Index: ui/gl/gl_surface.h
diff --git a/ui/gl/gl_surface.h b/ui/gl/gl_surface.h
index f7a02f042834247f9e125dc263db6d221029423b..70336ba6df89845717bd9c2957802168f91b36e4 100644
--- a/ui/gl/gl_surface.h
+++ b/ui/gl/gl_surface.h
@@ -57,11 +57,8 @@ class GL_EXPORT GLSurface : public base::RefCounted<GLSurface> {
   // Get the underlying platform specific surface "handle".
   virtual void* GetHandle() = 0;
 
-  // Returns space separated list of surface specific extensions.
-  // The surface must be current.
-  virtual std::string GetExtensions();
-
-  bool HasExtension(const char* name);
+  // Returns whether or not the surface supports PostSubBuffer.
+  virtual bool SupportsPostSubBuffer();
 
   // Returns the internal frame buffer object name if the surface is backed by
   // FBO. Otherwise returns 0.
@@ -147,7 +144,7 @@ class GL_EXPORT GLSurfaceAdapter : public GLSurface {
   virtual bool IsOffscreen() OVERRIDE;
   virtual bool SwapBuffers() OVERRIDE;
   virtual bool PostSubBuffer(int x, int y, int width, int height) OVERRIDE;
-  virtual std::string GetExtensions() OVERRIDE;
+  virtual bool SupportsPostSubBuffer() OVERRIDE;
   virtual gfx::Size GetSize() OVERRIDE;
   virtual void* GetHandle() OVERRIDE;
   virtual unsigned int GetBackingFrameBufferObject() OVERRIDE;