Add common page filtering logic for page load metrics.

chrome/browser/page_load_metrics/browser_page_track_decider.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/browser/page_load_metrics/browser_page_track_decider.h"
+
+#include <string>
+
+#include "chrome/browser/page_load_metrics/metrics_web_contents_observer.h"
+#include "content/public/browser/navigation_handle.h"
+#include "content/public/browser/web_contents.h"
+#include "net/http/http_response_headers.h"
+
+namespace page_load_metrics {
+
+BrowserPageTrackDecider::BrowserPageTrackDecider(
+    PageLoadMetricsEmbedderInterface* embedder_interface,
+    content::WebContents* web_contents,
+    content::NavigationHandle* navigation_handle)
+    : embedder_interface_(embedder_interface),
+      web_contents_(web_contents),
+      navigation_handle_(navigation_handle) {}
+
+BrowserPageTrackDecider::~BrowserPageTrackDecider() {}
+
+bool BrowserPageTrackDecider::HasCommitted() {
+  return navigation_handle_->HasCommitted();
+}
+
+bool BrowserPageTrackDecider::IsHttpOrHttpsUrl() {
+  return navigation_handle_->GetURL().SchemeIsHTTPOrHTTPS();
+}
+
+bool BrowserPageTrackDecider::IsNewTabPageUrl() {
+  return embedder_interface_->IsNewTabPageUrl(navigation_handle_->GetURL());
+}
+
+bool BrowserPageTrackDecider::IsChromeErrorPage() {
+  DCHECK(HasCommitted());
+  return navigation_handle_->IsErrorPage();
+}
+
+int BrowserPageTrackDecider::GetHttpStatusCode() {
+  DCHECK(HasCommitted());
+  const net::HttpResponseHeaders* response_headers =
+      navigation_handle_->GetResponseHeaders();
+  if (!response_headers)
+    return -1;
+  return response_headers->response_code();
+}
+
+bool BrowserPageTrackDecider::IsHtmlOrXhtmlPage() {
+  DCHECK(HasCommitted());
+  const std::string& mime_type = web_contents_->GetContentsMimeType();
+  return mime_type == "text/html" || mime_type == "application/xhtml+xml";
+}
+
+}  // namespace page_load_metrics