PlzNavigate: Enforce 'frame-src' CSP on the browser.

content/browser/frame_host/ancestor_throttle.h

Index: content/browser/frame_host/ancestor_throttle.h
diff --git a/content/browser/frame_host/ancestor_throttle.h b/content/browser/frame_host/ancestor_throttle.h
index a2b9a6fd2930b17eb179dd7886dda7d353b50200..5161b0ce25d21952a2a7bc578f8f8d3784cda503 100644
--- a/content/browser/frame_host/ancestor_throttle.h
+++ b/content/browser/frame_host/ancestor_throttle.h
@@ -38,6 +38,8 @@ class CONTENT_EXPORT AncestorThrottle : public NavigationThrottle {
 
   ~AncestorThrottle() override;
 
+  NavigationThrottle::ThrottleCheckResult WillStartRequest() override;
+  NavigationThrottle::ThrottleCheckResult WillRedirectRequest() override;
   NavigationThrottle::ThrottleCheckResult WillProcessResponse() override;
 
  private:
@@ -56,6 +58,9 @@ class CONTENT_EXPORT AncestorThrottle : public NavigationThrottle {
   HeaderDisposition ParseHeader(const net::HttpResponseHeaders* headers,
                                 std::string* header_value);
 
+  NavigationThrottle::ThrottleCheckResult CheckContentSecurityPolicyFrameSrc(
+      bool is_redirect);
+
   DISALLOW_COPY_AND_ASSIGN(AncestorThrottle);
 };