Make it possible to have 1 PpapiGlobals per thread. Update unit tests.

ppapi/shared_impl/test_globals.cc

Index: ppapi/shared_impl/test_globals.cc
diff --git a/ppapi/shared_impl/test_globals.cc b/ppapi/shared_impl/test_globals.cc
index e870e5cc5c4c7047dbcc222a2ee4a711828514de..3122f759a30f00f771111caa40f550868b5b3101 100644
--- a/ppapi/shared_impl/test_globals.cc
+++ b/ppapi/shared_impl/test_globals.cc
@@ -11,6 +11,11 @@ TestGlobals::TestGlobals()
       callback_tracker_(new CallbackTracker) {
 }
 
+TestGlobals::TestGlobals(PpapiGlobals::ForTest for_test)
+    : ppapi::PpapiGlobals(for_test),
+      callback_tracker_(new CallbackTracker) {
+}
+
 TestGlobals::~TestGlobals() {
 }
 
@@ -35,4 +40,8 @@ PP_Module TestGlobals::GetModuleForInstance(PP_Instance instance) {
   return 0;
 }
 
+base::Lock* TestGlobals::GetProxyLock() {
+  return NULL;
+}
+
 }  // namespace ppapi