gpu: Remove Echo and SwapCompletion GL interfacess

cc/trees/layer_tree_host_impl_unittest.cc

Index: cc/trees/layer_tree_host_impl_unittest.cc
diff --git a/cc/trees/layer_tree_host_impl_unittest.cc b/cc/trees/layer_tree_host_impl_unittest.cc
index dddc5125a34042aec6a538cf6e736c7da44b7c31..934c526a836b3faba1f28d0ba77b065796e98ceb 100644
--- a/cc/trees/layer_tree_host_impl_unittest.cc
+++ b/cc/trees/layer_tree_host_impl_unittest.cc
@@ -4335,8 +4335,7 @@ TEST_F(LayerTreeHostImplTest, PartialSwapReceivesDamageRect) {
   layer_tree_host_impl->DrawLayers(&frame, gfx::FrameTime::Now());
   layer_tree_host_impl->DidDrawAllLayers(frame);
   layer_tree_host_impl->SwapBuffers(frame);
-  EXPECT_EQ(TestContextSupport::SWAP,
-            context_provider->support()->last_swap_type());
+  EXPECT_EQ(TestGLES2Interface::SWAP, context_provider->last_swap_type());
 
   // Second frame, only the damaged area should get swapped. Damage should be
   // the union of old and new child rects.
@@ -4352,12 +4351,11 @@ TEST_F(LayerTreeHostImplTest, PartialSwapReceivesDamageRect) {
   // Make sure that partial swap is constrained to the viewport dimensions
   // expected damage rect: gfx::Rect(500, 500);
   // expected swap rect: flipped damage rect, but also clamped to viewport
-  EXPECT_EQ(TestContextSupport::PARTIAL_SWAP,
-            context_provider->support()->last_swap_type());
+  EXPECT_EQ(TestGLES2Interface::PARTIAL_SWAP,
+            context_provider->last_swap_type());
   gfx::Rect expected_swap_rect(0, 500-28, 26, 28);
   EXPECT_EQ(expected_swap_rect.ToString(),
-            context_provider->support()->
-                last_partial_swap_rect().ToString());
+            context_provider->last_partial_swap_rect().ToString());
 
   layer_tree_host_impl->SetViewportSize(gfx::Size(10, 10));
   // This will damage everything.
@@ -4368,8 +4366,7 @@ TEST_F(LayerTreeHostImplTest, PartialSwapReceivesDamageRect) {
   host_impl_->DidDrawAllLayers(frame);
   layer_tree_host_impl->SwapBuffers(frame);
 
-  EXPECT_EQ(TestContextSupport::SWAP,
-            context_provider->support()->last_swap_type());
+  EXPECT_EQ(TestGLES2Interface::SWAP, context_provider->last_swap_type());
 }
 
 TEST_F(LayerTreeHostImplTest, RootLayerDoesntCreateExtraSurface) {