[Fix build] TileRasterMode value passed to IsReadyToDraw must be initialized.

cc/resources/tile_manager.cc

 // Copyright 2012 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_manager.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 343 matching lines @@
     size_t* memory_used_bytes) const {
   *memory_required_bytes = 0;
   *memory_nice_to_have_bytes = 0;
   *memory_used_bytes = resource_pool_->acquired_memory_usage_bytes();
   for (TileVector::const_iterator it = tiles_.begin();
        it != tiles_.end();
        ++it) {
     const Tile* tile = *it;
     const ManagedTileState& mts = tile->managed_state();
 
-    TileRasterMode mode;
+    TileRasterMode mode = HIGH_QUALITY_RASTER_MODE;
     if (tile->IsReadyToDraw(&mode) &&
         !mts.tile_versions[mode].requires_resource())
       continue;
 
     size_t tile_bytes = tile->bytes_consumed_if_allocated();
     if (mts.gpu_memmgr_stats_bin == NOW_BIN)
       *memory_required_bytes += tile_bytes;
     if (mts.gpu_memmgr_stats_bin != NEVER_BIN)
       *memory_nice_to_have_bytes += tile_bytes;
   }
@@ skipping 240 matching lines @@
   mts.tile_versions[mode].forced_upload_ = false;
 }
 
 void TileManager::FreeResourcesForTile(Tile* tile) {
   for (int mode = 0; mode < NUM_RASTER_MODES; ++mode) {
     FreeResourceForTile(tile, static_cast<TileRasterMode>(mode));
   }
 }
 
 void TileManager::FreeUnusedResourcesForTile(Tile* tile) {
-  TileRasterMode used_mode;
+  TileRasterMode used_mode = HIGH_QUALITY_RASTER_MODE;
   bool version_is_used = tile->IsReadyToDraw(&used_mode);
   for (int mode = 0; mode < NUM_RASTER_MODES; ++mode) {
     if (!version_is_used || mode != used_mode)
       FreeResourceForTile(tile, static_cast<TileRasterMode>(mode));
   }
 }
 
 void TileManager::ScheduleTasks() {
   TRACE_EVENT0("cc", "TileManager::ScheduleTasks");
   RasterWorkerPool::RasterTask::Queue tasks;
@@ skipping 317 matching lines @@
         100000,
         100);
   } else {
     picture_pile->RasterToBitmap(&canvas, rect, contents_scale, NULL);
   }
 
   return true;
 }
 
 }  // namespace cc