Implement a ResourceThrottle for URL overriding in Chrome on Android.

chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.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/browser/renderer_host/chrome_resource_dispatcher_host_delegate.h"
 
 #include <string>
 
 #include "base/base64.h"
 #include "base/logging.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/content_settings/host_content_settings_map.h"
 #include "chrome/browser/download/download_request_limiter.h"
 #include "chrome/browser/download/download_resource_throttle.h"
 #include "chrome/browser/download/download_util.h"
 #include "chrome/browser/extensions/user_script_listener.h"
 #include "chrome/browser/external_protocol/external_protocol_handler.h"
 #include "chrome/browser/google/google_util.h"
 #include "chrome/browser/instant/instant_loader.h"
 #include "chrome/browser/net/load_timing_observer.h"
 #include "chrome/browser/prerender/prerender_manager.h"
 #include "chrome/browser/prerender/prerender_manager_factory.h"
 #include "chrome/browser/prerender/prerender_tracker.h"
 #include "chrome/browser/profiles/profile_io_data.h"
 #include "chrome/browser/renderer_host/chrome_url_request_user_data.h"
 #include "chrome/browser/renderer_host/safe_browsing_resource_throttle.h"
 #include "chrome/browser/renderer_host/transfer_navigation_resource_throttle.h"
+#include "chrome/browser/renderer_host/should_ignore_navigation_resource_throttle.h"
 #include "chrome/browser/safe_browsing/safe_browsing_service.h"
 #include "chrome/browser/ui/auto_login_prompter.h"
 #include "chrome/browser/ui/login/login_prompt.h"
 #include "chrome/browser/ui/sync/one_click_signin_helper.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/extensions/user_script.h"
 #include "chrome/common/metrics/experiments_helper.h"
 #include "chrome/common/metrics/proto/chrome_experiments.pb.h"
 #include "chrome/common/render_messages.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 124 matching lines @@
 
   if (resource_type == ResourceType::MAIN_FRAME) {
     throttles->push_back(new TransferNavigationResourceThrottle(request));
 
 #if defined(OS_CHROMEOS)
     // We check offline first, then check safe browsing so that we still can
     // block unsafe site after we remove offline page.
     throttles->push_back(new OfflineResourceThrottle(
         child_id, route_id, request, resource_context));
 #endif
+
+#if defined(OS_ANDROID)
+    throttles->push_back(new ShouldIgnoreNavigationResourceThrottle(request));

[joth, 2012/05/11 15:34:13]

this looks like a good point to also make it conditional on a runtime flag, so
we can avoid this check if we're running in browser mode.

(or we invent a new #define to use here for the embedded API mode, but I think
the runtime maybe better as eventually we could even use this optimization in
API mode too if the client hasn't been set / hasn't overridden the callback)

[mkosiba (inactive), 2012/05/15 14:20:23]

But we need this in browser mode!

It _might_ make sense to use this instead of
browser_handles_top_level_navigations in  Chrome Frame (in which case we'd
probably need to make the addition of the throttle depend on some runtime flag)
but that's a separate change.

[joth, 2012/05/15 14:30:43]

Yep makes sense. As discussed I was getting mixed up with the resource request
intercept case (again).

+#endif
   }
 
   AppendChromeMetricsHeaders(request, resource_context, resource_type);
 
   AppendStandardResourceThrottles(request,
                                   resource_context,
                                   child_id,
                                   route_id,
                                   resource_type,
                                   throttles);
@@ skipping 257 matching lines @@
   if (base::Base64Encode(serialized, &hashed)) {
     // If successful, swap the header value with the new one.
     // Note that the list of IDs and the header could be temporarily out of sync
     // if IDs are added as we are recreating the header, but we're OK with those
     // descrepancies.
     variation_ids_header_ = hashed;
   } else {
     DVLOG(1) << "Failed to base64 encode Variation IDs value: " << serialized;
   }
 }