Fix crash when translated ANGLE shader source has length zero.

gpu/command_buffer/service/program_manager.cc

Index: gpu/command_buffer/service/program_manager.cc
===================================================================
--- gpu/command_buffer/service/program_manager.cc	(revision 174988)
+++ gpu/command_buffer/service/program_manager.cc	(working copy)
@@ -472,7 +472,7 @@
         info->service_id(), max_len, &len, temp.get());
     DCHECK(max_len == 0 || len < max_len);
     DCHECK(len == 0 || temp[len] == '\0');
-    info->UpdateTranslatedSource(temp.get());
+    info->UpdateTranslatedSource(max_len ? temp.get() : NULL);
   }
 
   GLint status = GL_FALSE;