GL Implementation for GPU Discardable

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 479b2d6be187cde9f2c8555557e3138153ef5373..7addc3147fc5cceef4579e1a623369c5efc86979 100755
--- a/gpu/command_buffer/build_gles2_cmd_buffer.py
+++ b/gpu/command_buffer/build_gles2_cmd_buffer.py
@@ -4552,6 +4552,25 @@ _FUNCTION_INFO = {
     'decoder_func': 'DoSetEnableDCLayersCHROMIUM',
     'extension': 'CHROMIUM_dc_layers',
   },
+  'InitializeDiscardableTextureCHROMIUM': {
+    'type': 'Custom',
+    'cmd_args': 'GLuint texture_id, uint32_t shm_id, '
+                'uint32_t shm_offset',
+    'impl_func': False,
+    'client_test': False,
+    'extension': True,
+  },
+  'UnlockDiscardableTextureCHROMIUM': {
+    'type': 'Custom',
+    'cmd_args': 'GLuint texture_id',
+    'impl_func': False,
+    'client_test': False,
+    'extension': True,
+  },
+  'LockDiscardableTextureCHROMIUM': {
+    'type': 'NoCommand',
+    'extension': True,
+  },
 }