Add a command to lose the context

gpu/command_buffer/build_gles2_cmd_buffer.py

Index: gpu/command_buffer/build_gles2_cmd_buffer.py
diff --git a/gpu/command_buffer/build_gles2_cmd_buffer.py b/gpu/command_buffer/build_gles2_cmd_buffer.py
index 7a3e69735d5c54d9c754ada68ab4e99bfa5a3e98..df9bdd92db86bb183764179c0f92e079abb7463b 100755
--- a/gpu/command_buffer/build_gles2_cmd_buffer.py
+++ b/gpu/command_buffer/build_gles2_cmd_buffer.py
@@ -2290,6 +2290,12 @@ _FUNCTION_INFO = {
     'client_test': False,
     'extension': True,
   },
+  'LoseContextCHROMIUM': {
+    'type': 'Manual',
+    'impl_func': True,
+    'extension': True,
+    'chromium': True,
+  },
 }
 
 
@@ -3346,7 +3352,8 @@ class ManualHandler(CustomHandler):
 
   def WriteGLES2Implementation(self, func, file):
     """Overrriden from TypeHandler."""
-    pass
+    if func.GetInfo('impl_func'):
+      super(ManualHandler, self).WriteGLES2Implementation(func, file)
 
   def WriteGLES2ImplementationHeader(self, func, file):
     """Overrriden from TypeHandler."""