PlzNavigate: preserve SourceLocation when navigating

third_party/WebKit/public/web/WebFrameClient.h

Index: third_party/WebKit/public/web/WebFrameClient.h
diff --git a/third_party/WebKit/public/web/WebFrameClient.h b/third_party/WebKit/public/web/WebFrameClient.h
index 5bf558bdb55eb59a54a0fdb1fa37d2ecc475dc43..092fe6337cfe2b87ae284cc0f925c1239e79618a 100644
--- a/third_party/WebKit/public/web/WebFrameClient.h
+++ b/third_party/WebKit/public/web/WebFrameClient.h
@@ -45,6 +45,7 @@
 #include "WebNavigationType.h"
 #include "WebNavigatorContentUtilsClient.h"
 #include "WebSandboxFlags.h"
+#include "WebSourceLocation.h"
 #include "WebTextDirection.h"
 #include "public/platform/BlameContext.h"
 #include "public/platform/WebColor.h"
@@ -300,6 +301,8 @@ class BLINK_EXPORT WebFrameClient {
     bool isClientRedirect;
     WebFormElement form;
     bool isCacheDisabled;
+    bool hasSourceLocation;
+    WebSourceLocation sourceLocation;
 
     NavigationPolicyInfo(WebURLRequest& urlRequest)
         : extraData(nullptr),
@@ -309,7 +312,8 @@ class BLINK_EXPORT WebFrameClient {
           replacesCurrentHistoryItem(false),
           isHistoryNavigationInNewChildFrame(false),
           isClientRedirect(false),
-          isCacheDisabled(false) {}
+          isCacheDisabled(false),
+          hasSourceLocation(false) {}
   };
 
   virtual WebNavigationPolicy decidePolicyForNavigation(