Adds IDBKeyPath parser / extractor, and provides a mechanism to call it sandboxed.

chrome/utility/utility_thread.h

Index: chrome/utility/utility_thread.h
diff --git a/chrome/utility/utility_thread.h b/chrome/utility/utility_thread.h
index 1f86cdc464296c13b707e2ae3a785b0489d66de3..a92c08b622423afc674bb64f33a18ba7774b4894 100644
--- a/chrome/utility/utility_thread.h
+++ b/chrome/utility/utility_thread.h
@@ -14,6 +14,7 @@
 #include "printing/native_metafile.h"
 
 class GURL;
+class SerializedScriptValue;
 class SkBitmap;
 
 namespace gfx {
@@ -68,6 +69,25 @@ class UtilityThread : public ChildThread {
     int* highest_rendered_page_number);
 #endif   // defined(OS_WIN)
 
+  // IPC for extracting IDBKeys from SerializedScriptValues, used by IndexedDB.
+  void OnIDBKeysFromValuesAndKeyPath(
+      int id,
+      const std::vector<SerializedScriptValue>& serialized_script_values,
+      const string16& idb_key_path);
+
+  // IPC to notify we'll be running in batch mode instead of quitting after
+  // any of the IPCs above, we'll only quit during OnBatchModeFinished().
+  void OnBatchModeStarted();
+
+  // IPC to notify batch mode has finished and we should now quit.
+  void OnBatchModeFinished();
+
+  // Releases the process if we are not (or no longer) in batch mode.
+  void ReleaseProcessIfNeeded();
+
+  // True when we're running in batch mode.
+  bool batch_mode_;
+
   DISALLOW_COPY_AND_ASSIGN(UtilityThread);
 };