Reland of Add a NavigationThrottle to the public content/ interface

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index 25f4aa462679cd10704c7256488f194bcad52df4..bbe1c07e906f1ad7b85ba0f40cef7f22d033dab2 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -24,6 +24,7 @@
 #include "base/thread_task_runner_handle.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "chrome/browser/after_startup_task_utils.h"
+#include "chrome/browser/apps/app_url_redirector.h"
 #include "chrome/browser/browser_about_handler.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/browser_shutdown.h"
@@ -120,6 +121,8 @@
 #include "content/public/browser/child_process_data.h"
 #include "content/public/browser/child_process_security_policy.h"
 #include "content/public/browser/client_certificate_delegate.h"
+#include "content/public/browser/navigation_handle.h"
+#include "content/public/browser/navigation_throttle.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
@@ -173,6 +176,7 @@
 #include "chrome/browser/chrome_browser_main_android.h"
 #include "chrome/common/descriptors_android.h"
 #include "components/crash/content/browser/crash_dump_manager_android.h"
+#include "components/navigation_interception/intercept_navigation_delegate.h"
 #include "components/service_tab_launcher/browser/android/service_tab_launcher.h"
 #include "ui/base/resource/resource_bundle_android.h"
 #elif defined(OS_POSIX)
@@ -2598,6 +2602,34 @@
   }
 }
 
+ScopedVector<content::NavigationThrottle>
+ChromeContentBrowserClient::CreateThrottlesForNavigation(
+    content::NavigationHandle* handle) {
+  ScopedVector<content::NavigationThrottle> throttles;
+#if defined(OS_ANDROID)
+  // TODO(davidben): This is insufficient to integrate with prerender properly.
+  // https://crbug.com/370595
+  prerender::PrerenderContents* prerender_contents =
+      prerender::PrerenderContents::FromWebContents(handle->GetWebContents());
+  if (!prerender_contents && handle->IsInMainFrame()) {
+    throttles.push_back(
+        navigation_interception::InterceptNavigationDelegate::CreateThrottleFor(
+            handle)
+            .Pass());
+  }
+#else
+  if (handle->IsInMainFrame()) {
+    // Redirect some navigations to apps that have registered matching URL
+    // handlers ('url_handlers' in the manifest).
+    scoped_ptr<content::NavigationThrottle> url_to_app_throttle =
+        AppUrlRedirector::MaybeCreateThrottleFor(handle);
+    if (url_to_app_throttle)
+      throttles.push_back(url_to_app_throttle.Pass());
+  }
+#endif
+  return throttles.Pass();
+}
+
 content::DevToolsManagerDelegate*
 ChromeContentBrowserClient::GetDevToolsManagerDelegate() {
   return new ChromeDevToolsManagerDelegate();