gpu: Remove Echo and SwapCompletion GL interfacess

cc/test/test_gles2_interface.cc

Index: cc/test/test_gles2_interface.cc
diff --git a/cc/test/test_gles2_interface.cc b/cc/test/test_gles2_interface.cc
index c0a986d215918a05c3307e2a8ced74e29588bc8c..321165eb989a54451025986f2293b706b4fb7490 100644
--- a/cc/test/test_gles2_interface.cc
+++ b/cc/test/test_gles2_interface.cc
@@ -10,7 +10,7 @@
 namespace cc {
 
 TestGLES2Interface::TestGLES2Interface(TestWebGraphicsContext3D* test_context)
-    : test_context_(test_context) {
+    : test_context_(test_context), last_swap_type_(NO_SWAP) {
   DCHECK(test_context_);
 }
 
@@ -420,4 +420,16 @@ void TestGLES2Interface::LoseContextCHROMIUM(GLenum current, GLenum other) {
   test_context_->loseContextCHROMIUM(current, other);
 }
 
+void TestGLES2Interface::SwapBuffers() {
+  last_swap_type_ = SWAP;
+}
+
+void TestGLES2Interface::PostSubBufferCHROMIUM(GLint x,
+                                               GLint y,
+                                               GLint width,
+                                               GLint height) {
+  last_swap_type_ = PARTIAL_SWAP;
+  last_partial_swap_rect_ = gfx::Rect(x, y, width, height);
+}
+
 }  // namespace cc