PlzNavigate: preserve SourceLocation when navigating

content/common/navigation_params.h

Index: content/common/navigation_params.h
diff --git a/content/common/navigation_params.h b/content/common/navigation_params.h
index 105130740e309c150cf97dfef2ef918ad4a14e2d..fe8c71a797833bdd8539ef9ba92da9eaec214f44 100644
--- a/content/common/navigation_params.h
+++ b/content/common/navigation_params.h
@@ -36,6 +36,21 @@ namespace content {
 // about:blank. In these cases, no request needs to be sent.
 bool CONTENT_EXPORT ShouldMakeNetworkRequestForURL(const GURL& url);
 
+// PlzNavigate
+// Struct keeping track of the Javascript SourceLocation that triggered the
+// navigation. This is initialized based on information from Blink at the start
+// of navigation, and passed back to Blink when the navigation commits.
+struct CONTENT_EXPORT SourceLocation {
+  SourceLocation();
+  SourceLocation(const std::string& url,
+                 unsigned int line_number,
+                 unsigned int column_number);
+  ~SourceLocation();
+  std::string url;
+  unsigned int line_number;
+  unsigned int column_number;
+};
+
 // The following structures hold parameters used during a navigation. In
 // particular they are used by FrameMsg_Navigate, FrameMsg_CommitNavigation and
 // FrameHostMsg_BeginNavigation.
@@ -59,7 +74,8 @@ struct CONTENT_EXPORT CommonNavigationParams {
       PreviewsState previews_state,
       const base::TimeTicks& navigation_start,
       std::string method,
-      const scoped_refptr<ResourceRequestBodyImpl>& post_data);
+      const scoped_refptr<ResourceRequestBodyImpl>& post_data,
+      base::Optional<SourceLocation> source_location);
   CommonNavigationParams(const CommonNavigationParams& other);
   ~CommonNavigationParams();
 
@@ -120,6 +136,13 @@ struct CONTENT_EXPORT CommonNavigationParams {
 
   // Body of HTTP POST request.
   scoped_refptr<ResourceRequestBodyImpl> post_data;
+
+  // PlzNavigate
+  // Information about the Javascript source for this navigation. Used for
+  // providing information in console error messages triggered by the
+  // navigation. If the navigation was not caused by Javascript, this should not
+  // be set.
+  base::Optional<SourceLocation> source_location;
 };
 
 // Provided by the renderer ----------------------------------------------------