Add mojo service for CopylessPaste in Blink

A CopylessPaste mojo service in Blink is added. The parsed data would
be forwarded to the app indexing service.

BUG=693650

Review-Url: https://codereview.chromium.org/2787703002
Cr-Commit-Position: refs/heads/master@{#462826}

third_party/WebKit/Source/modules/ModulesInitializer.cpp

@@ -21,6 +21,7 @@
 #include "modules/canvas2d/CanvasRenderingContext2D.h"
 #include "modules/compositorworker/CompositorWorkerThread.h"
 #include "modules/csspaint/CSSPaintImageGeneratorImpl.h"
+#include "modules/document_metadata/CopylessPasteServer.h"
 #include "modules/filesystem/DraggedIsolatedFileSystemImpl.h"
 #include "modules/imagebitmap/ImageBitmapRenderingContext.h"
 #include "modules/installation/InstallationServiceImpl.h"
@@ -83,6 +84,10 @@ void ModulesInitializer::initialize() {
 
   // Mojo Interfaces registered with LocalFrame
   LocalFrame::registerInitializationCallback([](LocalFrame* frame) {
+    if (frame && frame->isMainFrame()) {
+      frame->interfaceRegistry()->addInterface(WTF::bind(
+          &CopylessPasteServer::bindMojoRequest, wrapWeakPersistent(frame)));
+    }
     frame->interfaceRegistry()->addInterface(
         WTF::bind(&InstallationServiceImpl::create, wrapWeakPersistent(frame)));
     // TODO(dominickn): This interface should be document-scoped rather than

third_party/WebKit/Source/modules/document_metadata/BUILD.gn

@@ -8,6 +8,8 @@ blink_modules_sources("document_metadata") {
   sources = [
     "CopylessPasteExtractor.cpp",
     "CopylessPasteExtractor.h",
+    "CopylessPasteServer.cpp",
+    "CopylessPasteServer.h",
   ]
 
   deps = []

third_party/WebKit/Source/modules/document_metadata/CopylessPasteServer.cpp

+// Copyright 2017 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 "modules/document_metadata/CopylessPasteServer.h"
+
+#include "core/frame/LocalFrame.h"
+#include "modules/document_metadata/CopylessPasteExtractor.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+
+namespace blink {
+
+CopylessPasteServer::CopylessPasteServer(LocalFrame& frame) : m_frame(frame) {}
+
+void CopylessPasteServer::bindMojoRequest(
+    LocalFrame* frame,
+    mojom::document_metadata::blink::CopylessPasteRequest request) {
+  DCHECK(frame);
+
+  // TODO(wychen): remove bindMojoRequest pattern, and make this a service
+  // associated with frame lifetime.
+  mojo::MakeStrongBinding(WTF::makeUnique<CopylessPasteServer>(*frame),
+                          std::move(request));
+}
+
+void CopylessPasteServer::GetEntities(const GetEntitiesCallback& callback) {
+  if (!m_frame || !m_frame->document()) {
+    callback.Run(nullptr);
+    return;
+  }
+  // TODO(wychen): connect with CopylessPasteExtractor::extract() like:
+  // callback.Run(CopylessPasteExtractor::extract(*m_frame->document()));
+  callback.Run(nullptr);
+}
+
+}  // namespace blink

third_party/WebKit/Source/modules/document_metadata/CopylessPasteServer.h

+// Copyright 2017 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.
+
+#ifndef CopylessPasteServer_h
+#define CopylessPasteServer_h
+
+#include "modules/ModulesExport.h"
+#include "platform/heap/Persistent.h"
+#include "public/platform/modules/document_metadata/copyless_paste.mojom-blink.h"
+
+namespace blink {
+
+class LocalFrame;
+
+// Mojo interface to return extracted metadata for AppIndexing.
+class MODULES_EXPORT CopylessPasteServer final
+    : public mojom::document_metadata::blink::CopylessPaste {
+ public:
+  explicit CopylessPasteServer(LocalFrame&);
+
+  static void bindMojoRequest(
+      LocalFrame*,
+      mojom::document_metadata::blink::CopylessPasteRequest);
+
+  void GetEntities(const GetEntitiesCallback&) override;
+
+ private:
+  WeakPersistent<LocalFrame> m_frame;
+};
+
+}  // namespace blink
+
+#endif  // CopylessPasteServer_h

third_party/WebKit/Source/modules/document_metadata/DEPS

+include_rules = [
+    "+mojo/public/cpp/bindings/binding.h",
+    "+mojo/public/cpp/bindings/strong_binding.h",
+]

third_party/WebKit/public/platform/modules/document_metadata/copyless_paste.mojom

@@ -34,3 +34,8 @@ struct WebPage {
   string title;
   array<Entity> entities;
 };
+
+// Null page denotes no results.
+interface CopylessPaste {
+  GetEntities() => (WebPage? page);
+};