cc: Add mailbox support to ResourceProvider write locks.

cc/resources/resource_provider_unittest.cc

Index: cc/resources/resource_provider_unittest.cc
diff --git a/cc/resources/resource_provider_unittest.cc b/cc/resources/resource_provider_unittest.cc
index b8426c07e76e9edef929361b5d29f06f3f0a831e..89e9314036b7326b42f3bef0edaa55b61c510140 100644
--- a/cc/resources/resource_provider_unittest.cc
+++ b/cc/resources/resource_provider_unittest.cc
@@ -3749,7 +3749,7 @@ TEST_P(ResourceProviderTest, GpuMemoryBufferReadLockFail) {
   {
     ResourceProvider::ScopedReadLockGpuMemoryBuffer lock(
         resource_provider_.get(), id);
-    EXPECT_FALSE(lock.GetGpuMemoryBuffer());
+    EXPECT_FALSE(lock.gpu_memory_buffer());
   }
 }
 
@@ -3774,7 +3774,7 @@ TEST_P(ResourceProviderTest, GpuMemoryBufferReadLockSucceed) {
   {
     ResourceProvider::ScopedReadLockGpuMemoryBuffer lock(
         resource_provider_.get(), id);
-    EXPECT_EQ(gpu_memory_buffer, lock.GetGpuMemoryBuffer());
+    EXPECT_EQ(gpu_memory_buffer, lock.gpu_memory_buffer());
   }
 }
 
@@ -3831,14 +3831,14 @@ TEST_P(ResourceProviderTest, ChildGpuMemoryBufferReadLock) {
   {
     ResourceProvider::ScopedReadLockGpuMemoryBuffer lock(
         resource_provider_.get(), list[0].id);
-    EXPECT_FALSE(lock.GetGpuMemoryBuffer());
+    EXPECT_FALSE(lock.gpu_memory_buffer());
   }
 
   // The gmb resource should have a GpuMemoryBuffer when locked
   {
     ResourceProvider::ScopedReadLockGpuMemoryBuffer lock(
         resource_provider_.get(), list[1].id);
-    gfx::GpuMemoryBuffer* parent_gmb = lock.GetGpuMemoryBuffer();
+    gfx::GpuMemoryBuffer* parent_gmb = lock.gpu_memory_buffer();
     EXPECT_TRUE(parent_gmb);
     EXPECT_NE(child_gmb, parent_gmb);