Workaround for PowerVR clear issue.

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"
 
@@ skipping 362 matching lines @@
         fShaderDerivativeSupport = ctxInfo.version() >= GR_GL_VER(3, 0) ||
                                    ctxInfo.hasExtension("GL_OES_standard_derivatives");
     }
 
     if (GrGLCaps::kES_IMG_MsToTexture_MSFBOType == fMSFBOType) {
         GR_GL_GetIntegerv(gli, GR_GL_MAX_SAMPLES_IMG, &fMaxSampleCount);
     } else if (GrGLCaps::kNone_MSFBOType != fMSFBOType) {
         GR_GL_GetIntegerv(gli, GR_GL_MAX_SAMPLES, &fMaxSampleCount);
     }
 
+    if (kPowerVR54x_GrGLRenderer == ctxInfo.renderer() ||
+        kPowerVRRogue_GrGLRenderer == ctxInfo.renderer()) {
+        fUseDrawInsteadOfClear = true;
+    }
+
     this->initConfigTexturableTable(ctxInfo, gli);
     this->initConfigRenderableTable(ctxInfo);
 
     return true;
 }
 
 void GrGLCaps::initConfigRenderableTable(const GrGLContextInfo& ctxInfo) {
 
     // OpenGL < 3.0
     //  no support for render targets unless the GL_ARB_framebuffer_object
@@ skipping 473 matching lines @@
     r.appendf("Two Format Limit: %s\n", (fTwoFormatLimit ? "YES": "NO"));
     r.appendf("Fragment coord conventions support: %s\n",
              (fFragCoordsConventionSupport ? "YES": "NO"));
     r.appendf("Vertex array object support: %s\n", (fVertexArrayObjectSupport ? "YES": "NO"));
     r.appendf("Use non-VBO for dynamic data: %s\n",
              (fUseNonVBOVertexAndIndexDynamicData ? "YES" : "NO"));
     r.appendf("Full screen clear is free: %s\n", (fFullClearIsFree ? "YES" : "NO"));
     r.appendf("Drops tile on zero divide: %s\n", (fDropsTileOnZeroDivide ? "YES" : "NO"));
     return r;
 }