command_buffer: Table based command dispatch for Common commands

gpu/command_buffer/service/common_decoder.h

Index: gpu/command_buffer/service/common_decoder.h
diff --git a/gpu/command_buffer/service/common_decoder.h b/gpu/command_buffer/service/common_decoder.h
index aaf860fd7b33068540206603da3162a9fbab871a..fc9ecf22433266fe4351b7a07e959a09437e3626 100644
--- a/gpu/command_buffer/service/common_decoder.h
+++ b/gpu/command_buffer/service/common_decoder.h
@@ -155,9 +155,7 @@ class GPU_EXPORT CommonDecoder : NON_EXPORTED_BASE(public AsyncAPIInterface) {
   // Generate a member function prototype for each command in an automated and
   // typesafe way.
   #define COMMON_COMMAND_BUFFER_CMD_OP(name)             \
-     error::Error Handle##name(                          \
-       uint32 immediate_data_size,                       \
-       const cmd::name& args);                           \
+     error::Error Handle##name(uint32 immediate_data_size, const void* data);
 
   COMMON_COMMAND_BUFFER_CMDS(COMMON_COMMAND_BUFFER_CMD_OP)
 
@@ -167,6 +165,22 @@ class GPU_EXPORT CommonDecoder : NON_EXPORTED_BASE(public AsyncAPIInterface) {
 
   typedef std::map<uint32, linked_ptr<Bucket> > BucketMap;
   BucketMap buckets_;
+
+  typedef Error (CommonDecoder::*CmdHandler)(
+      uint32 immediate_data_size,
+      const void* data);
+
+  // A struct to hold info about each command.
+  struct CommandInfo {
+    CmdHandler cmd_handler;
+    uint8 arg_flags;   // How to handle the arguments for this command
+    uint8 cmd_flags;   // How to handle this command
+    uint16 arg_count;  // How many arguments are expected for this command.
+  };
+
+  // A table of CommandInfo for all the commands.
+  static const CommandInfo command_info[];
+
 };
 
 }  // namespace gpu