gpu: Reuse transfer buffers more aggresively

gpu/command_buffer/client/fenced_allocator_test.cc

Index: gpu/command_buffer/client/fenced_allocator_test.cc
diff --git a/gpu/command_buffer/client/fenced_allocator_test.cc b/gpu/command_buffer/client/fenced_allocator_test.cc
index cc99ed36522a238caaa8f4d0de7f29ee2a60cca7..15600a1fae1669647f1f5234d2a339f6e8e49dd3 100644
--- a/gpu/command_buffer/client/fenced_allocator_test.cc
+++ b/gpu/command_buffer/client/fenced_allocator_test.cc
@@ -88,6 +88,11 @@ class BaseFencedAllocatorTest : public testing::Test {
 const unsigned int BaseFencedAllocatorTest::kBufferSize;
 #endif
 
+namespace {
+void EmptyPoll() {
+}
+}
+
 // Test fixture for FencedAllocator test - Creates a FencedAllocator, using a
 // CommandBufferHelper with a mock AsyncAPIInterface for its interface (calling
 // it directly, not through the RPC mechanism), making sure Noops are ignored
@@ -96,7 +101,9 @@ class FencedAllocatorTest : public BaseFencedAllocatorTest {
  protected:
   virtual void SetUp() {
     BaseFencedAllocatorTest::SetUp();
-    allocator_.reset(new FencedAllocator(kBufferSize, helper_.get()));
+    allocator_.reset(new FencedAllocator(kBufferSize,
+                                         helper_.get(),
+                                         base::Bind(&EmptyPoll)));
   }

[piman, 2014/02/20 01:52:37]

Could we add a test that exercises the poll feature at the low level?
Create a FencedAllocator passing a mock Poll function. Allocate several entries.
Call FreeUnused, with/whithout the mock Poll function set up to free an entry.
Check consistency.

 
   virtual void TearDown() {
@@ -406,7 +413,9 @@ class FencedAllocatorWrapperTest : public BaseFencedAllocatorTest {
     // something.
     buffer_.reset(static_cast<char*>(base::AlignedAlloc(
         kBufferSize, kAllocAlignment)));
-    allocator_.reset(new FencedAllocatorWrapper(kBufferSize, helper_.get(),
+    allocator_.reset(new FencedAllocatorWrapper(kBufferSize,
+                                                helper_.get(),
+                                                base::Bind(&EmptyPoll),
                                                 buffer_.get()));
   }