Add a flag to disable partial raster in renderer

content/renderer/gpu/render_widget_compositor.cc

 // Copyright (c) 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 "content/renderer/gpu/render_widget_compositor.h"
 
 #include <limits>
 #include <string>
 
 #include "base/command_line.h"
@@ skipping 280 matching lines @@
       compositor_deps_->GetGpuRasterizationMSAASampleCount();
   settings.gpu_rasterization_forced =
       compositor_deps_->IsGpuRasterizationForced();
   settings.gpu_rasterization_enabled =
       compositor_deps_->IsGpuRasterizationEnabled();
 
   settings.can_use_lcd_text = compositor_deps_->IsLcdTextEnabled();
   settings.use_distance_field_text =
       compositor_deps_->IsDistanceFieldTextEnabled();
   settings.use_zero_copy = compositor_deps_->IsZeroCopyEnabled();
-  settings.use_persistent_map_for_gpu_memory_buffers =
-      compositor_deps_->IsPersistentGpuMemoryBufferEnabled();
+  settings.use_partial_raster = compositor_deps_->IsPartialRasterEnabled();
   settings.enable_elastic_overscroll =
       compositor_deps_->IsElasticOverscrollEnabled();
   settings.use_image_texture_targets =
       compositor_deps_->GetImageTextureTargets();
   settings.image_decode_tasks_enabled =
       compositor_deps_->AreImageDecodeTasksEnabled();
 
   if (cmd->HasSwitch(cc::switches::kTopControlsShowThreshold)) {
       std::string top_threshold_str =
           cmd->GetSwitchValueASCII(cc::switches::kTopControlsShowThreshold);
@@ skipping 773 matching lines @@
   // Ignore what the system said and give all clients the same maximum
   // allocation on desktop platforms.
   actual.bytes_limit_when_visible = 512 * 1024 * 1024;
   actual.priority_cutoff_when_visible =
       gpu::MemoryAllocation::CUTOFF_ALLOW_NICE_TO_HAVE;
 #endif
   return actual;
 }
 
 }  // namespace content