Revert of Allow one-copy task tile worker pool to use compressed textures.

blimp/client/compositor/blimp_layer_tree_settings.cc

 // Copyright 2015 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 "blimp/client/compositor/blimp_layer_tree_settings.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 48 matching lines @@
     settings->gpu_rasterization_enabled = false;
   settings->using_synchronous_renderer_compositor = false;
   settings->scrollbar_animator = cc::LayerTreeSettings::LINEAR_FADE;
   settings->scrollbar_fade_delay_ms = 300;
   settings->scrollbar_fade_resize_delay_ms = 2000;
   settings->scrollbar_fade_duration_ms = 300;
   settings->solid_color_scrollbar_color = SkColorSetARGB(128, 128, 128, 128);
   settings->renderer_settings.highp_threshold_min = 2048;
   settings->ignore_root_layer_flings = false;
   bool use_low_memory_policy = base::SysInfo::IsLowEndDevice();
+  settings->renderer_settings.use_rgba_4444_textures = use_low_memory_policy;
   if (use_low_memory_policy) {
     // On low-end we want to be very carefull about killing other
     // apps. So initially we use 50% more memory to avoid flickering
     // or raster-on-demand.
     settings->max_memory_for_prepaint_percentage = 67;
-
-    settings->renderer_settings.preferred_tile_format = cc::RGBA_4444;
   } else {
     // On other devices we have increased memory excessively to avoid
     // raster-on-demand already, so now we reserve 50% _only_ to avoid
     // raster-on-demand, and use 50% of the memory otherwise.
     settings->max_memory_for_prepaint_percentage = 50;
   }
   settings->renderer_settings.should_clear_root_render_pass = true;
 
   // TODO(danakj): Only do this on low end devices.
   settings->create_low_res_tiling = true;
@@ skipping 14 matching lines @@
   // show the pinch scrollbars when at minimum scale.
   // TODO(dtrainor): Update this since https://crrev.com/1267603004 landed.
   // settings->scrollbar_show_scale_threshold = 1.05f;
 #endif
 
   // Blimp always uses new cc::AnimationHost system.
   settings->use_compositor_animation_timelines = true;
 }
 
 }  // namespace blimp