Defer compositor context creation to the thread.

cc/trees/layer_tree_host_unittest_copyrequest.cc

Index: cc/trees/layer_tree_host_unittest_copyrequest.cc
diff --git a/cc/trees/layer_tree_host_unittest_copyrequest.cc b/cc/trees/layer_tree_host_unittest_copyrequest.cc
index b92c687529b3f31449e347ab7428e9f2c823ac00..6466b576c4f75a8b9d4abf4cd7fa2ee1febaf755 100644
--- a/cc/trees/layer_tree_host_unittest_copyrequest.cc
+++ b/cc/trees/layer_tree_host_unittest_copyrequest.cc
@@ -128,16 +128,23 @@ class LayerTreeHostCopyRequestTestMultipleRequests
       return FakeOutputSurface::CreateSoftware(
           base::WrapUnique(new SoftwareOutputDevice));
     }
-    std::unique_ptr<FakeOutputSurface> output_surface =
-        FakeOutputSurface::Create3d();
-    TestContextSupport* context_support = static_cast<TestContextSupport*>(
-        output_surface->context_provider()->ContextSupport());
-    context_support->set_out_of_order_callbacks(out_of_order_callbacks_);
-    return output_surface;
+    auto create = base::MakeUnique<TestContextProvider::DeferredCreate>();
+    create->created_context = &context_provider_;
+    return FakeOutputSurface::Create3d(std::move(create));
+  }
+
+  void InitializedRendererOnThread(LayerTreeHostImpl* host_impl,
+                                   bool success) override {
+    ASSERT_TRUE(success);
+    if (use_gl_renderer_) {
+      context_provider_->support()->set_out_of_order_callbacks(
+          out_of_order_callbacks_);
+    }
   }
 
   bool use_gl_renderer_;
   bool out_of_order_callbacks_ = false;
+  TestContextProvider* context_provider_ = nullptr;
   std::map<size_t, gfx::Size> callbacks_;
   FakeContentLayerClient client_;
   scoped_refptr<FakePictureLayer> root;
@@ -707,13 +714,17 @@ class LayerTreeHostCopyRequestTestLostOutputSurface
  protected:
   std::unique_ptr<FakeOutputSurface> CreateFakeOutputSurface() override {
     if (!first_context_provider_) {
-      first_context_provider_ = TestContextProvider::Create();
-      return FakeOutputSurface::Create3d(first_context_provider_);
+      std::unique_ptr<TestContextProvider::DeferredCreate> first_create(
+          new TestContextProvider::DeferredCreate);
+      first_create->created_context = &first_context_provider_;
+      return FakeOutputSurface::Create3d(std::move(first_create));
     }
 
     EXPECT_FALSE(second_context_provider_);
-    second_context_provider_ = TestContextProvider::Create();
-    return FakeOutputSurface::Create3d(second_context_provider_);
+    std::unique_ptr<TestContextProvider::DeferredCreate> second_create(
+        new TestContextProvider::DeferredCreate);
+    second_create->created_context = &second_context_provider_;
+    return FakeOutputSurface::Create3d(std::move(second_create));
   }
 
   void SetupTree() override {
@@ -767,13 +778,18 @@ class LayerTreeHostCopyRequestTestLostOutputSurface
     // releasing the copy output request will cause the texture in the request
     // to be released, so we should have 1 less by now.
     EXPECT_EQ(num_textures_after_loss_ - 1,
-              first_context_provider_->TestContext3d()->NumTextures());
+              saved_first_context_provider_->TestContext3d()->NumTextures());
+    // Drop the saved reference on the compositor thread.
+    saved_first_context_provider_ = nullptr;
     EndTest();
   }
 
   void SwapBuffersOnThread(LayerTreeHostImpl* impl, bool result) override {
     switch (impl->active_tree()->source_frame_number()) {
       case 0:
+        EXPECT_TRUE(first_context_provider_);
+        EXPECT_FALSE(second_context_provider_);
+
         // The layers have been drawn, so their textures have been allocated.
         EXPECT_FALSE(result_);
         num_textures_without_readback_ =
@@ -787,6 +803,9 @@ class LayerTreeHostCopyRequestTestLostOutputSurface
                        base::Unretained(this)));
         break;
       case 1:
+        EXPECT_TRUE(first_context_provider_);
+        EXPECT_FALSE(second_context_provider_);
+
         // We did a readback, so there will be a readback texture around now.
         EXPECT_LT(num_textures_without_readback_,
                   first_context_provider_->TestContext3d()->NumTextures());
@@ -796,9 +815,15 @@ class LayerTreeHostCopyRequestTestLostOutputSurface
         // the test to advance to the next case.
         break;
       case 2:
+        EXPECT_TRUE(first_context_provider_);
+        EXPECT_FALSE(second_context_provider_);
+
         // The readback texture is collected.
         EXPECT_TRUE(result_);
 
+        saved_first_context_provider_ =
+            make_scoped_refptr(first_context_provider_);
+
         // Lose the output surface.
         first_context_provider_->TestContext3d()->loseContextCHROMIUM(
             GL_GUILTY_CONTEXT_RESET_ARB, GL_INNOCENT_CONTEXT_RESET_ARB);
@@ -808,7 +833,7 @@ class LayerTreeHostCopyRequestTestLostOutputSurface
         EXPECT_TRUE(second_context_provider_);
 
         num_textures_after_loss_ =
-            first_context_provider_->TestContext3d()->NumTextures();
+            saved_first_context_provider_->TestContext3d()->NumTextures();
 
         // Now destroy the CopyOutputResult, releasing the texture inside back
         // to the compositor. Then check the resulting number of allocated
@@ -824,8 +849,11 @@ class LayerTreeHostCopyRequestTestLostOutputSurface
 
   void AfterTest() override {}
 
-  scoped_refptr<TestContextProvider> first_context_provider_;
-  scoped_refptr<TestContextProvider> second_context_provider_;
+  TestContextProvider* first_context_provider_ = nullptr;
+  TestContextProvider* second_context_provider_ = nullptr;
+  // Keep the first_context_provider_ alive past this compositor instance being
+  // done with it.
+  scoped_refptr<TestContextProvider> saved_first_context_provider_;
   size_t num_textures_without_readback_ = 0;
   size_t num_textures_after_loss_ = 0;
   FakeContentLayerClient client_;
@@ -841,8 +869,10 @@ class LayerTreeHostCopyRequestTestCountTextures
     : public LayerTreeHostCopyRequestTest {
  protected:
   std::unique_ptr<FakeOutputSurface> CreateFakeOutputSurface() override {
-    context_provider_ = TestContextProvider::Create();
-    return FakeOutputSurface::Create3d(context_provider_);
+    std::unique_ptr<TestContextProvider::DeferredCreate> create(
+        new TestContextProvider::DeferredCreate);
+    create->created_context = &context_provider_;
+    return FakeOutputSurface::Create3d(std::move(create));
   }
 
   void SetupTree() override {
@@ -903,7 +933,7 @@ class LayerTreeHostCopyRequestTestCountTextures
 
   virtual void DoEndTest() { EndTest(); }
 
-  scoped_refptr<TestContextProvider> context_provider_;
+  TestContextProvider* context_provider_ = nullptr;
   size_t num_textures_without_readback_;
   size_t num_textures_with_readback_;
   gpu::SyncToken waited_sync_token_after_readback_;
@@ -951,7 +981,6 @@ class LayerTreeHostCopyRequestTestProvideTexture
  protected:
   void BeginTest() override {
     external_context_provider_ = TestContextProvider::Create();
-    EXPECT_TRUE(external_context_provider_->BindToCurrentThread());
     LayerTreeHostCopyRequestTestCountTextures::BeginTest();
   }