Reland of Add a NavigationThrottle to the public content/ interface

content/browser/frame_host/navigation_handle_impl.cc

Index: content/browser/frame_host/navigation_handle_impl.cc
diff --git a/content/browser/frame_host/navigation_handle_impl.cc b/content/browser/frame_host/navigation_handle_impl.cc
index 2c5e773cace4de12b361e5a6032121f782f21834..994a2fc553a7579b95404fa28a981fa99bb5eba2 100644
--- a/content/browser/frame_host/navigation_handle_impl.cc
+++ b/content/browser/frame_host/navigation_handle_impl.cc
@@ -5,6 +5,8 @@
 #include "content/browser/frame_host/navigation_handle_impl.h"
 
 #include "content/browser/frame_host/navigator_delegate.h"
+#include "content/public/browser/content_browser_client.h"
+#include "content/public/common/content_client.h"
 #include "net/url_request/redirect_info.h"
 
 namespace content {
@@ -12,7 +14,7 @@
 // static
 scoped_ptr<NavigationHandleImpl> NavigationHandleImpl::Create(
     const GURL& url,
-    const bool is_main_frame,
+    bool is_main_frame,
     NavigatorDelegate* delegate) {
   return scoped_ptr<NavigationHandleImpl>(
       new NavigationHandleImpl(url, is_main_frame, delegate));
@@ -22,10 +24,14 @@
                                            const bool is_main_frame,
                                            NavigatorDelegate* delegate)
     : url_(url),
+      is_main_frame_(is_main_frame),
+      is_post_(false),
+      has_user_gesture_(false),
+      transition_(ui::PAGE_TRANSITION_LINK),
+      is_external_protocol_(false),
       net_error_code_(net::OK),
-      state_(DID_START),
-      is_main_frame_(is_main_frame),
       is_same_page_(false),
+      state_(INITIAL),
       is_transferring_(false),
       delegate_(delegate) {
   delegate_->DidStartNavigation(this);
@@ -35,16 +41,46 @@
   delegate_->DidFinishNavigation(this);
 }
 
-const GURL& NavigationHandleImpl::GetURL() const {
+const GURL& NavigationHandleImpl::GetURL() {
   return url_;
 }
 
-net::Error NavigationHandleImpl::GetNetErrorCode() const {
-  return net_error_code_;
+bool NavigationHandleImpl::IsInMainFrame() {
+  return is_main_frame_;
 }
 
-bool NavigationHandleImpl::IsInMainFrame() const {
-  return is_main_frame_;
+bool NavigationHandleImpl::IsPost() {
+  CHECK_NE(INITIAL, state_)
+      << "This accessor should not be called before the request is started.";
+  return is_post_;
+}
+
+const Referrer& NavigationHandleImpl::GetReferrer() {
+  CHECK_NE(INITIAL, state_)
+      << "This accessor should not be called before the request is started.";
+  return sanitized_referrer_;
+}
+
+bool NavigationHandleImpl::HasUserGesture() {
+  CHECK_NE(INITIAL, state_)
+      << "This accessor should not be called before the request is started.";
+  return has_user_gesture_;
+}
+
+ui::PageTransition NavigationHandleImpl::GetPageTransition() {
+  CHECK_NE(INITIAL, state_)
+      << "This accessor should not be called before the request is started.";
+  return transition_;
+}
+
+bool NavigationHandleImpl::IsExternalProtocol() {
+  CHECK_NE(INITIAL, state_)
+      << "This accessor should not be called before the request is started.";
+  return is_external_protocol_;
+}
+
+net::Error NavigationHandleImpl::GetNetErrorCode() {
+  return net_error_code_;
 }
 
 bool NavigationHandleImpl::IsSamePage() {
@@ -54,12 +90,97 @@
   return is_same_page_;
 }
 
-bool NavigationHandleImpl::HasCommittedDocument() const {
+bool NavigationHandleImpl::HasCommittedDocument() {
   return state_ == DID_COMMIT;
 }
 
-bool NavigationHandleImpl::HasCommittedErrorPage() const {
+bool NavigationHandleImpl::HasCommittedErrorPage() {
   return state_ == DID_COMMIT_ERROR_PAGE;
+}
+
+void NavigationHandleImpl::RegisterThrottleForTesting(
+    scoped_ptr<NavigationThrottle> navigation_throttle) {
+  throttles_.push_back(navigation_throttle.Pass());
+}
+
+NavigationThrottle::ThrottleCheckResult
+NavigationHandleImpl::CallWillStartRequestForTesting(
+    bool is_post,
+    const Referrer& sanitized_referrer,
+    bool has_user_gesture,
+    ui::PageTransition transition,
+    bool is_external_protocol) {
+  return WillStartRequest(is_post, sanitized_referrer, has_user_gesture,
+                          transition, is_external_protocol);
+}
+
+NavigationThrottle::ThrottleCheckResult
+NavigationHandleImpl::CallWillRedirectRequestForTesting(
+    const GURL& new_url,
+    bool new_method_is_post,
+    const GURL& new_referrer_url,
+    bool new_is_external_protocol) {
+  return WillRedirectRequest(new_url, new_method_is_post, new_referrer_url,
+                             new_is_external_protocol);
+}
+
+NavigationThrottle::ThrottleCheckResult NavigationHandleImpl::WillStartRequest(
+    bool is_post,
+    const Referrer& sanitized_referrer,
+    bool has_user_gesture,
+    ui::PageTransition transition,
+    bool is_external_protocol) {
+  // Update the navigation parameters.
+  is_post_ = is_post;
+  sanitized_referrer_ = sanitized_referrer;
+  has_user_gesture_ = has_user_gesture;
+  transition_ = transition;
+  is_external_protocol_ = is_external_protocol;
+
+  state_ = WILL_SEND_REQUEST;
+
+  // Register the navigation throttles. The ScopedVector returned by
+  // GetNavigationThrottles is not assigned to throttles_ directly because it
+  // would overwrite any throttle previously added with
+  // RegisterThrottleForTesting.
+  ScopedVector<NavigationThrottle> throttles_to_register =
+      GetContentClient()->browser()->CreateThrottlesForNavigation(this);
+  if (throttles_to_register.size() > 0) {
+    throttles_.insert(throttles_.end(), throttles_to_register.begin(),
+                      throttles_to_register.end());
+    throttles_to_register.weak_clear();
+  }
+
+  // Notify each throttle of the request.
+  for (NavigationThrottle* throttle : throttles_) {
+    NavigationThrottle::ThrottleCheckResult result =
+        throttle->WillStartRequest();
+    if (result == NavigationThrottle::CANCEL_AND_IGNORE)
+      return NavigationThrottle::CANCEL_AND_IGNORE;
+  }
+  return NavigationThrottle::PROCEED;
+}
+
+NavigationThrottle::ThrottleCheckResult
+NavigationHandleImpl::WillRedirectRequest(const GURL& new_url,
+                                          bool new_method_is_post,
+                                          const GURL& new_referrer_url,
+                                          bool new_is_external_protocol) {
+  // Update the navigation parameters.
+  url_ = new_url;
+  is_post_ = new_method_is_post;
+  sanitized_referrer_.url = new_referrer_url;
+  sanitized_referrer_ = Referrer::SanitizeForRequest(url_, sanitized_referrer_);
+  is_external_protocol_ = new_is_external_protocol;
+
+  // Have each throttle be notified of the request.
+  for (NavigationThrottle* throttle : throttles_) {
+    NavigationThrottle::ThrottleCheckResult result =
+        throttle->WillRedirectRequest();
+    if (result == NavigationThrottle::CANCEL_AND_IGNORE)
+      return NavigationThrottle::CANCEL_AND_IGNORE;
+  }
+  return NavigationThrottle::PROCEED;
 }
 
 void NavigationHandleImpl::DidRedirectNavigation(const GURL& new_url) {