Move prepareForExternalIO implementation from GrContext to GrDrawingManager

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"
 #include "GrContextPriv.h"
 #include "GrContextOptions.h"
@@ skipping 500 matching lines @@
         return srcPI.convertPixelsTo(&dstPI, width, height);
     }
     return true;
 }
 
 void GrContext::prepareSurfaceForExternalIO(GrSurface* surface) {
     ASSERT_SINGLE_OWNER
     RETURN_IF_ABANDONED
     SkASSERT(surface);
     ASSERT_OWNED_RESOURCE(surface);
-    if (surface->surfacePriv().hasPendingIO()) {
-        this->flush();
-    }
-    GrRenderTarget* rt = surface->asRenderTarget();
-    if (fGpu && rt) {
-        fGpu->resolveRenderTarget(rt);
-    }
+    fDrawingManager->prepareSurfaceForExternalIO(surface);
 }
 
 bool GrContext::copySurface(GrSurface* dst, GrSurface* src, const SkIRect& srcRect,
                             const SkIPoint& dstPoint) {
     ASSERT_SINGLE_OWNER
     RETURN_FALSE_IF_ABANDONED
     GR_AUDIT_TRAIL_AUTO_FRAME(&fAuditTrail, "GrContext::copySurface");
 
     if (!src || !dst) {
         return false;
@@ skipping 298 matching lines @@
     ASSERT_SINGLE_OWNER
     fResourceCache->setLimits(maxTextures, maxTextureBytes);
 }
 
 //////////////////////////////////////////////////////////////////////////////
 
 void GrContext::dumpMemoryStatistics(SkTraceMemoryDump* traceMemoryDump) const {
     ASSERT_SINGLE_OWNER
     fResourceCache->dumpMemoryStatistics(traceMemoryDump);
 }