cc: Make LayerTreeHostImpl unittests use a delegating output surface.

cc/test/test_gles2_interface.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/test/test_gles2_interface.h"
 
 #include "base/logging.h"
 #include "cc/test/test_web_graphics_context_3d.h"
 #include "gpu/GLES2/gl2extchromium.h"
 
 namespace cc {
 
-TestGLES2Interface::TestGLES2Interface(TestWebGraphicsContext3D* test_context)
-    : test_context_(test_context) {
-  DCHECK(test_context_);
-}
-
-TestGLES2Interface::~TestGLES2Interface() {}
+TestGLES2Interface::TestGLES2Interface() = default;
+TestGLES2Interface::~TestGLES2Interface() = default;
 
 void TestGLES2Interface::GenTextures(GLsizei n, GLuint* textures) {
   for (GLsizei i = 0; i < n; ++i) {
     textures[i] = test_context_->createTexture();
   }
 }
 
 void TestGLES2Interface::GenBuffers(GLsizei n, GLuint* buffers) {
   for (GLsizei i = 0; i < n; ++i) {
     buffers[i] = test_context_->createBuffer();
@@ skipping 364 matching lines @@
 void TestGLES2Interface::LoseContextCHROMIUM(GLenum current, GLenum other) {
   test_context_->loseContextCHROMIUM(current, other);
 }
 
 GLenum TestGLES2Interface::GetGraphicsResetStatusKHR() {
   if (test_context_->isContextLost())
     return GL_UNKNOWN_CONTEXT_RESET_KHR;
   return GL_NO_ERROR;
 }
 
+void TestGLES2Interface::set_test_context(TestWebGraphicsContext3D* context) {
+  DCHECK(!test_context_);
+  test_context_ = context;
+  InitializeTestContext(test_context_);
+}
+
 }  // namespace cc