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 7884a205114d051ef6da65b233e7c43386c7c4c0..891844c6e529f1b7b1456934093fca56567f6f19 100644
--- a/cc/resources/resource_provider_unittest.cc
+++ b/cc/resources/resource_provider_unittest.cc
@@ -3722,7 +3722,7 @@ TEST_P(ResourceProviderTest, GpuMemoryBufferReadLockFail) {
   {
     ResourceProvider::ScopedReadLockGpuMemoryBuffer lock(
         resource_provider_.get(), id);
-    EXPECT_FALSE(lock.GetGpuMemoryBuffer());
+    EXPECT_FALSE(lock.gpu_memory_buffer());
   }
 }
 
@@ -3747,7 +3747,7 @@ 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());
   }
 }
 
@@ -3804,14 +3804,14 @@ 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);