Do not give GPU memory to backgrounded compositors.

cc/output/output_surface_unittest.cc

Index: cc/output/output_surface_unittest.cc
diff --git a/cc/output/output_surface_unittest.cc b/cc/output/output_surface_unittest.cc
index 1a1db29d88c13eaf4dc8cee586e2058e6fe666f7..e2018c41d4e2ba098c97cb9181ea05b30053b1bc 100644
--- a/cc/output/output_surface_unittest.cc
+++ b/cc/output/output_surface_unittest.cc
@@ -430,42 +430,21 @@ TEST(OutputSurfaceTest, MemoryAllocation) {
   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);
 }