Get signals working in the EXTRA_DATA section of MHTML

chrome/browser/android/offline_pages/prerendering_offliner.h

Index: chrome/browser/android/offline_pages/prerendering_offliner.h
diff --git a/chrome/browser/android/offline_pages/prerendering_offliner.h b/chrome/browser/android/offline_pages/prerendering_offliner.h
index 9b1104cc57c095584df446246558d7c27dbe1107..fdfaa88a75e06c90be5c4aa6272e93b0c2b9bd30 100644
--- a/chrome/browser/android/offline_pages/prerendering_offliner.h
+++ b/chrome/browser/android/offline_pages/prerendering_offliner.h
@@ -8,6 +8,7 @@
 #include <memory>
 
 #include "base/android/application_status_listener.h"
+#include "base/files/file_path.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/android/offline_pages/prerendering_loader.h"
 #include "components/offline_pages/core/background/offliner.h"
@@ -69,7 +70,8 @@ class PrerenderingOffliner : public Offliner {
   // Callback logic for OfflinePageModel::SavePage().
   void OnSavePageDone(const SavePageRequest& request,
                       SavePageResult save_result,
-                      int64_t offline_id);
+                      int64_t offline_id,
+                      const base::FilePath& saved_filepath);
 
   PrerenderingLoader* GetOrCreateLoader();
 
@@ -77,6 +79,21 @@ class PrerenderingOffliner : public Offliner {
   void OnApplicationStateChange(
       base::android::ApplicationState application_state);
 
+  // Transfer over to the FileThread, and call AppendSignalData from there.
+  void AppendSignalDataOnFileThread(const base::FilePath& file_path);
+
+  // Add signal data to the end of the MHTML file.
+  void AppendSignalData(const base::FilePath& filename);
+
+  // TODO: Find a standard function to replace this with.

[fgorski, 2017/03/08 18:56:43]

std::isspace ?

+  static bool IsWhitespace(char next);
+
+  // Return the file position just before the two dashes.
+  static int64_t PositionBeforeTwoDashes(base::File& saved_file);
+
+  // Parse the boundary string from a MHTML file
+  static std::string GetBoundaryStringFromFile(base::File& saved_file);
+
   // Not owned.
   content::BrowserContext* browser_context_;
   // Not owned.