Do not give GPU memory to backgrounded compositors.

cc/output/output_surface_unittest.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/output/output_surface.h"
 
 #include "base/test/test_simple_task_runner.h"
 #include "cc/debug/test_context_provider.h"
 #include "cc/debug/test_web_graphics_context_3d.h"
 #include "cc/output/managed_memory_policy.h"
@@ skipping 412 matching lines @@
 
   TestOutputSurface output_surface(context_provider);
 
   FakeOutputSurfaceClient client;
   EXPECT_TRUE(output_surface.BindToClient(&client));
 
   ManagedMemoryPolicy policy(0);
   policy.bytes_limit_when_visible = 1234;
   policy.priority_cutoff_when_visible =
       gpu::MemoryAllocation::CUTOFF_ALLOW_REQUIRED_ONLY;
-  policy.bytes_limit_when_not_visible = 4567;
-  policy.priority_cutoff_when_not_visible =
-      gpu::MemoryAllocation::CUTOFF_ALLOW_NOTHING;
 
-  bool discard_backbuffer_when_not_visible = false;
-
-  context_provider->SetMemoryAllocation(policy,
-                                        discard_backbuffer_when_not_visible);
+  context_provider->SetMemoryAllocation(policy);
   EXPECT_EQ(1234u, client.memory_policy().bytes_limit_when_visible);
   EXPECT_EQ(gpu::MemoryAllocation::CUTOFF_ALLOW_REQUIRED_ONLY,
             client.memory_policy().priority_cutoff_when_visible);
-  EXPECT_EQ(4567u, client.memory_policy().bytes_limit_when_not_visible);
-  EXPECT_EQ(gpu::MemoryAllocation::CUTOFF_ALLOW_NOTHING,
-            client.memory_policy().priority_cutoff_when_not_visible);
-  EXPECT_FALSE(client.discard_backbuffer_when_not_visible());
-
-  discard_backbuffer_when_not_visible = true;
-  context_provider->SetMemoryAllocation(policy,
-                                        discard_backbuffer_when_not_visible);
-  EXPECT_TRUE(client.discard_backbuffer_when_not_visible());
 
   policy.priority_cutoff_when_visible =
       gpu::MemoryAllocation::CUTOFF_ALLOW_EVERYTHING;
-  policy.priority_cutoff_when_not_visible =
-      gpu::MemoryAllocation::CUTOFF_ALLOW_NICE_TO_HAVE;
-  context_provider->SetMemoryAllocation(policy,
-                                        discard_backbuffer_when_not_visible);
+  context_provider->SetMemoryAllocation(policy);
   EXPECT_EQ(gpu::MemoryAllocation::CUTOFF_ALLOW_EVERYTHING,
             client.memory_policy().priority_cutoff_when_visible);
-  EXPECT_EQ(gpu::MemoryAllocation::CUTOFF_ALLOW_NICE_TO_HAVE,
-            client.memory_policy().priority_cutoff_when_not_visible);
 
   // 0 bytes limit should be ignored.
   policy.bytes_limit_when_visible = 0;
-  context_provider->SetMemoryAllocation(policy,
-                                        discard_backbuffer_when_not_visible);
+  context_provider->SetMemoryAllocation(policy);
   EXPECT_EQ(1234u, client.memory_policy().bytes_limit_when_visible);
 }
 
 TEST(OutputSurfaceTest, SoftwareOutputDeviceBackbufferManagement) {
   TestSoftwareOutputDevice* software_output_device =
       new TestSoftwareOutputDevice();
 
   // TestOutputSurface now owns software_output_device and has responsibility to
   // free it.
   scoped_ptr<TestSoftwareOutputDevice> p(software_output_device);
   TestOutputSurface output_surface(p.PassAs<SoftwareOutputDevice>());
 
   EXPECT_EQ(0, software_output_device->ensure_backbuffer_count());
   EXPECT_EQ(0, software_output_device->discard_backbuffer_count());
 
   output_surface.EnsureBackbuffer();
   EXPECT_EQ(1, software_output_device->ensure_backbuffer_count());
   EXPECT_EQ(0, software_output_device->discard_backbuffer_count());
   output_surface.DiscardBackbuffer();
 
   EXPECT_EQ(1, software_output_device->ensure_backbuffer_count());
   EXPECT_EQ(1, software_output_device->discard_backbuffer_count());
 }
 
 }  // namespace
 }  // namespace cc