Set gpu memory policy in UI compositor.

ui/compositor/compositor.cc

 // Copyright (c) 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 "ui/compositor/compositor.h"
 
 #include <algorithm>
 #include <deque>
 
 #include "base/bind.h"
@@ skipping 148 matching lines @@
             static_cast<gfx::BufferFormat>(format), usage);
   }
 
   // Note: Only enable image decode tasks if we have more than one worker
   // thread.
   settings.image_decode_tasks_enabled = false;
 
   settings.use_compositor_animation_timelines =
       command_line->HasSwitch(switches::kUIEnableCompositorAnimationTimelines);
 
+#if !defined(OS_ANDROID)
+  // TODO(sohanjg): Revisit this memory usage in tile manager.
+  cc::ManagedMemoryPolicy policy(
+      512 * 1024 * 1024, gpu::MemoryAllocation::CUTOFF_ALLOW_NICE_TO_HAVE,
+      settings.memory_policy_.num_resources_limit);
+  settings.memory_policy_ = policy;
+#endif
+
   base::TimeTicks before_create = base::TimeTicks::Now();
 
   cc::LayerTreeHost::InitParams params;
   params.client = this;
   params.shared_bitmap_manager = context_factory_->GetSharedBitmapManager();
   params.gpu_memory_buffer_manager =
       context_factory_->GetGpuMemoryBufferManager();
   params.task_graph_runner = context_factory_->GetTaskGraphRunner();
   params.settings = &settings;
   params.main_task_runner = task_runner_;
@@ skipping 313 matching lines @@
                     observer_list_,
                     OnCompositingLockStateChanged(this));
 }
 
 void Compositor::CancelCompositorLock() {
   if (compositor_lock_)
     compositor_lock_->CancelLock();
 }
 
 }  // namespace ui