Add common page filtering logic for page load metrics.

chrome/renderer/page_load_metrics/renderer_page_tracker_predicate.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 "chrome/renderer/page_load_metrics/renderer_page_tracker_predicate.h"
+
+#include <string>
+
+#include "chrome/renderer/searchbox/search_bouncer.h"
+#include "third_party/WebKit/public/platform/WebURLResponse.h"
+#include "third_party/WebKit/public/web/WebDocument.h"
+#include "url/gurl.h"
+
+namespace page_load_metrics {
+
+RendererPageTrackerPredicate::RendererPageTrackerPredicate(
+    const blink::WebDocument* document,
+    const blink::WebURLResponse* url_response)
+    : document_(document), url_response_(url_response) {}
+
+RendererPageTrackerPredicate::~RendererPageTrackerPredicate() {}
+
+bool RendererPageTrackerPredicate::HasCommitted() {
+  // RendererPageTrackerPredicate is only instantiated for committed pages. TODO
+  // see if blink exposes a concept of whether the current page is provisional
+  // or committed.
+  return true;
+}
+
+bool RendererPageTrackerPredicate::IsHTTPOrHTTPSUrl() {
+  const GURL url = document_->url();
+  return url.SchemeIsHTTPOrHTTPS();
+}
+
+bool RendererPageTrackerPredicate::IsNewTabPageUrl() {
+  return SearchBouncer::GetInstance()->IsNewTabPage(document_->url());
+}
+
+bool RendererPageTrackerPredicate::IsChromeErrorPage() {
+  // TODO figure out if blink or content exposes information to know whether the
+  // current page is a chrome error page.
+  return false;
+}
+
+bool RendererPageTrackerPredicate::IsNetworkErrorPage() {
+  // 2xx and 3xx (304 not modified) response codes are not error pages.
+  int status_code_family = url_response_->httpStatusCode() / 100;
+  return status_code_family != 2 && status_code_family != 3;
+}
+
+bool RendererPageTrackerPredicate::IsHTMLOrXHTMLPage() {
+  // Ignore non-HTML documents (e.g. SVG). Note that images are treated by
+  // Blink as HTML documents, so to exclude images, we must perform
+  // additional mime type checking below.
+  if (!document_->isHTMLDocument() && !document_->isXHTMLDocument())
+    return false;
+
+  // Ignore non-HTML mime types (e.g. images).
+  std::string mime_type = url_response_->mimeType().utf8();
+  return mime_type == "text/html" || mime_type == "application/xhtml+xml";
+}
+
+}  // namespace page_load_metrics