Work around for nexus 6 TexSubImage issue

src/gpu/GrContext.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 "GrContext.h"
 
@@ skipping 306 matching lines @@
 }
 
 bool GrContext::writeSurfacePixels(GrSurface* surface,
                                    int left, int top, int width, int height,
                                    GrPixelConfig srcConfig, const void* buffer, size_t rowBytes,
                                    uint32_t pixelOpsFlags) {
     RETURN_FALSE_IF_ABANDONED
     {
         GrTexture* texture = NULL;
         if (!(kUnpremul_PixelOpsFlag & pixelOpsFlags) && (texture = surface->asTexture()) &&
-            fGpu->canWriteTexturePixels(texture, srcConfig)) {
+            fGpu->canWriteTexturePixels(texture, srcConfig) &&
+            (!fCaps->useDrawInsteadOfPartialRenderTargetWrite() || !surface->asRenderTarget() ||
+              (width == texture->width() && height == texture->height()))) {
 
             if (!(kDontFlush_PixelOpsFlag & pixelOpsFlags) &&
                 surface->surfacePriv().hasPendingIO()) {
                 this->flush();
             }
             return fGpu->writeTexturePixels(texture, left, top, width, height,
                                             srcConfig, buffer, rowBytes);
             // Don't need to check kFlushWrites_PixelOp here, we just did a direct write so the
             // upload is already flushed.
         }
@@ skipping 407 matching lines @@
 //////////////////////////////////////////////////////////////////////////////
 
 void GrContext::addGpuTraceMarker(const GrGpuTraceMarker* marker) {
     fGpu->addGpuTraceMarker(marker);
 }
 
 void GrContext::removeGpuTraceMarker(const GrGpuTraceMarker* marker) {
     fGpu->removeGpuTraceMarker(marker);
 }