remove dst/rendertarget support for kARGB_4444_Config

src/gpu/gl/GrGpuGL.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "GrGpuGL.h"
 #include "GrGLStencilBuffer.h"
@@ skipping 200 matching lines @@
         // On ES we can only hope for R8
         fConfigRenderSupport[kAlpha_8_GrPixelConfig] =
                                 this->glCaps().textureRedSupport();
     }
 
     if (kDesktop_GrGLBinding != this->glBinding()) {
         // only available in ES
         fConfigRenderSupport[kRGB_565_GrPixelConfig] = true;
     }
 
-    // Pre 3.0, Ganesh relies on either GL_ARB_framebuffer_object or
-    // GL_EXT_framebuffer_object for FBO support. Both of these
-    // allow RGBA4 render targets so this is always supported.
-    fConfigRenderSupport[kRGBA_4444_GrPixelConfig] = true;
+    // we no longer support 444 as a render target
+    fConfigRenderSupport[kRGBA_4444_GrPixelConfig] = false;
 
     if (this->glCaps().rgba8RenderbufferSupport()) {
         fConfigRenderSupport[kRGBA_8888_GrPixelConfig] = true;
     }
 
     if (this->glCaps().bgraFormatSupport()) {
         fConfigRenderSupport[kBGRA_8888_GrPixelConfig] = true;
     }
 }
 
@@ skipping 2260 matching lines @@
             this->setVertexArrayID(gpu, 0);
         }
         int attrCount = gpu->glCaps().maxVertexAttributes();
         if (fDefaultVertexArrayAttribState.count() != attrCount) {
             fDefaultVertexArrayAttribState.resize(attrCount);
         }
         attribState = &fDefaultVertexArrayAttribState;
     }
     return attribState;
 }