cc: Make IsReadyToDraw/NeedsRaster usage consistent.

cc/resources/tile_draw_info.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/resources/tile_draw_info.h"
 
 #include "cc/base/math_util.h"
 
 namespace cc {
 
 TileDrawInfo::TileDrawInfo()
     : mode_(RESOURCE_MODE), solid_color_(SK_ColorWHITE) {
 }
 
 TileDrawInfo::~TileDrawInfo() {
   DCHECK(!resource_);
 }
 
-bool TileDrawInfo::IsReadyToDraw() const {
-  switch (mode_) {
-    case RESOURCE_MODE:
-      return !!resource_;
-    case SOLID_COLOR_MODE:
-    case OOM_MODE:
-      return true;
-  }
-  NOTREACHED();
-  return false;
-}
-
 void TileDrawInfo::AsValueInto(base::trace_event::TracedValue* state) const {
   state->SetBoolean("is_solid_color", mode_ == SOLID_COLOR_MODE);
   state->SetBoolean("is_transparent",
                     mode_ == SOLID_COLOR_MODE && !SkColorGetA(solid_color_));
 }
 
 }  // namespace cc