disable passing discards through GrIODB.

src/gpu/GrInOrderDrawBuffer.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 "GrInOrderDrawBuffer.h"
 
 #include "GrBufferAllocPool.h"
@@ skipping 627 matching lines @@
                 fStates[currState].restoreTo(&playbackState);
                 ++currState;
                 break;
             case kSetClip_Cmd:
                 clipData.fClipStack = &fClips[currClip];
                 clipData.fOrigin = fClipOrigins[currClip];
                 fDstGpu->setClip(&clipData);
                 ++currClip;
                 break;
             case kClear_Cmd:
-                if (GrColor_ILLEGAL == fClears[currClear].fColor) {
+                if (false && GrColor_ILLEGAL == fClears[currClear].fColor) {
                     fDstGpu->discard(fClears[currClear].fRenderTarget);
                 } else {
                     fDstGpu->clear(&fClears[currClear].fRect,
                                    fClears[currClear].fColor,
                                    fClears[currClear].fCanIgnoreRect,
                                    fClears[currClear].fRenderTarget);
                 }
                 ++currClear;
                 break;
             case kCopySurface_Cmd:
@@ skipping 323 matching lines @@
     this->addToCmdBuffer(kCopySurface_Cmd);
     return &fCopySurfaces.push_back();
 }
 
 
 void GrInOrderDrawBuffer::clipWillBeSet(const GrClipData* newClipData) {
     INHERITED::clipWillBeSet(newClipData);
     fClipSet = true;
     fClipProxyState = kUnknown_ClipProxyState;
 }