cc: Add flag to specify to ResourceProvider to always use GMBs

cc/test/pixel_test.cc

Index: cc/test/pixel_test.cc
diff --git a/cc/test/pixel_test.cc b/cc/test/pixel_test.cc
index 75e4ea1f804d0bf019924386759bc63e2cd611cb..08bdff34cacf9219ce82c99a2b7cb8d4ef3d1380 100644
--- a/cc/test/pixel_test.cc
+++ b/cc/test/pixel_test.cc
@@ -136,6 +136,7 @@ void PixelTest::SetUpGLRenderer(bool use_skia_gpu_backend,
   resource_provider_ = ResourceProvider::Create(
       output_surface_.get(), shared_bitmap_manager_.get(),
       gpu_memory_buffer_manager_.get(), main_thread_task_runner_.get(), 0, 1,
+      settings_.renderer_settings.use_gpu_memory_buffers_by_default,
       settings_.use_image_texture_targets);
 
   texture_mailbox_deleter_ = make_scoped_ptr(
@@ -177,6 +178,7 @@ void PixelTest::SetUpSoftwareRenderer() {
   resource_provider_ = ResourceProvider::Create(
       output_surface_.get(), shared_bitmap_manager_.get(),
       gpu_memory_buffer_manager_.get(), main_thread_task_runner_.get(), 0, 1,
+      settings_.renderer_settings.use_gpu_memory_buffers_by_default,
       settings_.use_image_texture_targets);
   renderer_ =
       SoftwareRenderer::Create(this, &settings_.renderer_settings,