Add render frame observer for CopylessPaste

third_party/WebKit/Source/modules/document_metadata/CopylessPasteExtractor.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/CopylessPasteExtractor.h"
 
 #include "core/HTMLNames.h"
 #include "core/dom/Document.h"
 #include "core/dom/ElementTraversal.h"
 #include "core/frame/LocalFrame.h"
 #include "core/html/HTMLElement.h"
 #include "platform/Histogram.h"
 #include "platform/instrumentation/tracing/TraceEvent.h"
+#include "public/platform/InterfaceProvider.h"
+#include "public/platform/Platform.h"
+#include "public/platform/modules/document_metadata/copyless_paste.mojom-blink.h"
 #include "wtf/text/StringBuilder.h"
 
 namespace blink {
 
 namespace {
 
 String extractMetadata(Element& root) {
   StringBuilder result;
   result.append("[");
   bool multiple = false;
   for (Element& element : ElementTraversal::descendantsOf(root)) {
     if (element.hasTagName(HTMLNames::scriptTag) &&
         element.getAttribute(HTMLNames::typeAttr) == "application/ld+json") {
       if (multiple) {
         result.append(",");
       }
       result.append(element.textContent());
       multiple = true;
     }
   }
   result.append("]");
   return result.toString();
 }
 
+void sendToIcing(Document& document, String extraction) {
+  mojom::blink::CopylessPastePtr servicePtr;
+  Platform::current()->interfaceProvider()->getInterface(
+      mojo::MakeRequest(&servicePtr));
+  DCHECK(servicePtr);
+  if (!servicePtr.is_bound())
+    return;
+  servicePtr->ReportEntityJsonLd(document.url().getString(), extraction);
+}
+
 }  // namespace
 
-String CopylessPasteExtractor::extract(Document& document) {
+String CopylessPasteExtractor::metadata(Document& document) {
   TRACE_EVENT0("blink", "CopylessPasteExtractor::extract");
 
   if (!document.frame() || !document.frame()->isMainFrame())
     return emptyString;
 
   DCHECK(document.hasFinishedParsing());
 
   Element* html = document.documentElement();
   if (!html)
     return emptyString;
 
   double startTime = monotonicallyIncreasingTime();
 
   // Traverse the DOM tree and extract the metadata.
   String result = extractMetadata(*html);
 
   double elapsedTime = monotonicallyIncreasingTime() - startTime;
 
   DEFINE_STATIC_LOCAL(CustomCountHistogram, extractionHistogram,
                       ("CopylessPaste.ExtractionUs", 1, 1000000, 50));
   extractionHistogram.count(static_cast<int>(1e6 * elapsedTime));
+
   return result;
 }
 
+void CopylessPasteExtractor::extract(Document& document) {
+  String result = metadata(document);
+  if (result != "[]") {
+    sendToIcing(document, result);
+  }
+}
+
 }  // namespace blink