Allow binding multiple textures to one DC Layer overlay.

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 01593a3ab3d3c1d3855b3f9aa753bff62012473a..1284488722bb2ab4ea127e1d0ad86a2c7063a4d3 100755
--- a/gpu/command_buffer/build_gles2_cmd_buffer.py
+++ b/gpu/command_buffer/build_gles2_cmd_buffer.py
@@ -4400,11 +4400,18 @@ _FUNCTION_INFO = {
                 'GLint z_order, GLuint shm_id, GLuint shm_offset',
     'extension': 'CHROMIUM_schedule_ca_layer',
   },
+  'SetDCLayerTextureCHROMIUM': {
+    'decoder_func': 'DoSetDCLayerTextureCHROMIUM',
+    'client_test': False,
+    'cmd_args': 'GLuint index, GLuint contents_texture_id',
+    'extension': 'CHROMIUM_schedule_ca_layer',
+    'expectation': False,
+  },
   'ScheduleDCLayerCHROMIUM': {
     'type': 'Custom',
     'impl_func': False,
     'client_test': False,
-    'cmd_args': 'GLuint contents_texture_id, GLuint background_color, '
+    'cmd_args': 'GLuint background_color, '
                 'GLuint edge_aa_mask, GLuint filter, GLuint shm_id, '
                 'GLuint shm_offset',
     'extension': 'CHROMIUM_schedule_ca_layer',