Add BlimpDocument, pull out functions in BlimpCompositor.

blimp/client/core/render_widget/blimp_document.cc

Index: blimp/client/core/render_widget/blimp_document.cc
diff --git a/blimp/client/core/render_widget/blimp_document.cc b/blimp/client/core/render_widget/blimp_document.cc
new file mode 100644
index 0000000000000000000000000000000000000000..072ca4a5f8530c0063e614e60a4f425d1c1f09c4
--- /dev/null
+++ b/blimp/client/core/render_widget/blimp_document.cc
@@ -0,0 +1,42 @@
+// 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 document_id,
+                             BlimpCompositorDependencies* compositor_deps,
+                             BlimpDocumentManager* document_manager)
+    : document_id_(document_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_ = std::move(compositor);
+}
+
+void BlimpDocument::SendWebGestureEvent(
+    const blink::WebGestureEvent& gesture_event) {
+  manager_->SendWebGestureEvent(document_id_, gesture_event);
+}
+
+void BlimpDocument::SendCompositorMessage(
+    const cc::proto::CompositorMessage& message) {
+  manager_->SendCompositorMessage(document_id_, message);
+}
+
+}  // namespace client
+}  // namespace blimp