Add BlimpDocument, pull out functions in BlimpCompositor.

blimp/client/core/render_widget/blimp_document.cc

+// Copyright 2016 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 "blimp/client/core/render_widget/blimp_document.h"
+
+#include "blimp/client/core/render_widget/blimp_document_manager.h"
+#include "cc/layers/layer.h"
+
+namespace blimp {
+namespace client {
+
+BlimpDocument::BlimpDocument(int render_widget_id,
+                             BlimpCompositorDependencies* compositor_deps,
+                             BlimpDocumentManager* document_manager)
+    : render_widget_id_(render_widget_id), manager_(document_manager) {
+  compositor_ = base::MakeUnique<BlimpCompositor>(compositor_deps, this);
+}
+
+BlimpDocument::~BlimpDocument() = default;
+
+BlimpCompositor* BlimpDocument::GetCompositor() {
+  return compositor_.get();
+}
+
+void BlimpDocument::SetCompositorForTest(
+    std::unique_ptr<BlimpCompositor> compositor) {
+  compositor_.reset();

[Khushal, 2016/10/03 20:04:59]

nit: Don't need to reset.

[xingliu, 2016/10/04 18:33:49]

Done.

+  compositor_ = std::move(compositor);
+}
+
+void BlimpDocument::SendWebGestureEvent(
+    const blink::WebGestureEvent& gesture_event) {
+  manager_->SendWebGestureEvent(render_widget_id_, gesture_event);
+}
+
+void BlimpDocument::SendCompositorMessage(
+    const cc::proto::CompositorMessage& message) {
+  manager_->SendCompositorMessage(render_widget_id_, message);
+}
+
+}  // namespace client
+}  // namespace blimp