Plumb in flag for reusing scratch textures

src/gpu/gl/GrGLCaps.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "GrGLCaps.h"
 #include "GrGLContext.h"
@@ skipping 271 matching lines @@
     GR_GL_GetIntegerv(gli, GR_GL_MAX_RENDERBUFFER_SIZE, &fMaxRenderTargetSize);
     // Our render targets are always created with textures as the color
     // attachment, hence this min:
     fMaxRenderTargetSize = GrMin(fMaxTextureSize, fMaxRenderTargetSize);
 
     fPathStencilingSupport = GR_GL_USE_NV_PATH_RENDERING &&
                              ctxInfo.hasExtension("GL_NV_path_rendering");
 
     fDstReadInShaderSupport = kNone_FBFetchType != fFBFetchType;
 
+    fReuseScratchTextures = kARM_GrGLVendor != ctxInfo.vendor();
+
     // Enable supported shader-related caps
     if (kDesktop_GrGLBinding == binding) {
         fDualSourceBlendingSupport = ctxInfo.version() >= GR_GL_VER(3,3) ||
                                      ctxInfo.hasExtension("GL_ARB_blend_func_extended");
         fShaderDerivativeSupport = true;
         // we don't support GL_ARB_geometry_shader4, just GL 3.2+ GS
         fGeometryShaderSupport = ctxInfo.version() >= GR_GL_VER(3,2) &&
                                  ctxInfo.glslGeneration() >= k150_GrGLSLGeneration;
     } else {
         fShaderDerivativeSupport = ctxInfo.hasExtension("GL_OES_standard_derivatives");
@@ skipping 278 matching lines @@
     GrPrintf("GL_ARB_imaging support: %s\n", (fImagingSupport ? "YES": "NO"));
     GrPrintf("Two Format Limit: %s\n", (fTwoFormatLimit ? "YES": "NO"));
     GrPrintf("Fragment coord conventions support: %s\n",
              (fFragCoordsConventionSupport ? "YES": "NO"));
     GrPrintf("Vertex array object support: %s\n", (fVertexArrayObjectSupport ? "YES": "NO"));
     GrPrintf("Use non-VBO for dynamic data: %s\n",
              (fUseNonVBOVertexAndIndexDynamicData ? "YES" : "NO"));
     GrPrintf("Core Profile: %s\n", (fIsCoreProfile ? "YES" : "NO"));
     GrPrintf("Discard FrameBuffer support: %s\n", (fDiscardFBSupport ? "YES" : "NO"));
 }