[Contextual Search] Add Mojo-enabled API component.

chrome/renderer/chrome_content_renderer_client.cc

 // Copyright (c) 2012 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/chrome_content_renderer_client.h"
 
 #include "base/command_line.h"
 #include "base/debug/crash_logging.h"
 #include "base/logging.h"
 #include "base/metrics/field_trial.h"
@@ skipping 16 matching lines @@
 #include "chrome/common/url_constants.h"
 #include "chrome/grit/generated_resources.h"
 #include "chrome/grit/locale_settings.h"
 #include "chrome/grit/renderer_resources.h"
 #include "chrome/renderer/banners/app_banner_client.h"
 #include "chrome/renderer/benchmarking_extension.h"
 #include "chrome/renderer/chrome_render_frame_observer.h"
 #include "chrome/renderer/chrome_render_process_observer.h"
 #include "chrome/renderer/chrome_render_view_observer.h"
 #include "chrome/renderer/content_settings_observer.h"
+#include "chrome/renderer/contextualsearch/contextual_search_wrapper.h"
 #include "chrome/renderer/external_extension.h"
 #include "chrome/renderer/loadtimes_extension_bindings.h"
 #include "chrome/renderer/media/chrome_key_systems.h"
 #include "chrome/renderer/net/net_error_helper.h"
 #include "chrome/renderer/net_benchmarking_extension.h"
 #include "chrome/renderer/page_load_histograms.h"
 #include "chrome/renderer/pepper/pepper_helper.h"
 #include "chrome/renderer/plugins/non_loadable_plugin_placeholder.h"
 #include "chrome/renderer/plugins/plugin_preroller.h"
 #include "chrome/renderer/plugins/plugin_uma.h"
@@ skipping 504 matching lines @@
 #endif
 
   if (render_frame->IsMainFrame()) {
     // Only attach NetErrorHelper to the main frame, since only the main frame
     // should get error pages.
     new NetErrorHelper(render_frame);
 
     // Only attach MainRenderFrameObserver to the main frame, since
     // we only want to log page load metrics for the main frame.
     new page_load_metrics::MetricsRenderFrameObserver(render_frame);
+
+    // Install Contextual Search support in the main frame if needed.
+    if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+            switches::kContextualSearchProcess)) {

[pedro (no code reviews), 2015/10/20 01:24:41]

Is there a better way to identify a Contextual Search process? Checking for the
command line flag seems brittle.

[Donn Denman, 2015/10/20 21:56:46]

No better way that I know of.  I don't think it's brittle since there's a
dedicated flag for this, but it did seem hacky to me when I first saw it in use.

There are advantages to this approch, the main ones being that we're guaranteed
to get the setting established before renderer startup, and that it's fairly
widely used, IMHO.  

+      search::ContextualSearchWrapper::Install(render_frame->GetWebFrame());
+    }
   } else {
     // Avoid any race conditions from having the browser tell subframes that
     // they're prerendering.
     if (prerender::PrerenderHelper::IsPrerendering(
             render_frame->GetRenderView()->GetMainRenderFrame())) {
       new prerender::PrerenderHelper(render_frame);
     }
   }
 
   // Set up a mojo service to test if this page is a distiller page.
@@ skipping 1104 matching lines @@
 // chrome.system.network.getNetworkInterfaces provides the same
 // information. Also, the enforcement of sending and binding UDP is already done
 // by chrome extension permission model.
 bool ChromeContentRendererClient::ShouldEnforceWebRTCRoutingPreferences() {
 #if defined(ENABLE_EXTENSIONS)
   return !IsStandaloneExtensionProcess();
 #else
   return true;
 #endif
 }