Use macro to simplify gpu driver bug workaround defs and code.

gpu/command_buffer/service/gpu_driver_bug_workaround_type.h

Index: gpu/command_buffer/service/gpu_driver_bug_workaround_type.h
===================================================================
--- gpu/command_buffer/service/gpu_driver_bug_workaround_type.h	(revision 192406)
+++ gpu/command_buffer/service/gpu_driver_bug_workaround_type.h	(working copy)
@@ -7,32 +7,55 @@
 
 #include "gpu/gpu_export.h"
 
+#define GPU_DRIVER_BUG_WORKAROUNDS(GPU_OP)            \
+  GPU_OP(CLEAR_ALPHA_IN_READPIXELS,                   \
+         clear_alpha_in_readpixels)                   \
+  GPU_OP(CLEAR_UNIFORMS_BEFORE_PROGRAM_USE,           \
+         clear_uniforms_before_program_use)           \
+  GPU_OP(DELETE_INSTEAD_OF_RESIZE_FBO,                \
+         delete_instead_of_resize_fbo)                \
+  GPU_OP(DISABLE_ANGLE_FRAMEBUFFER_MULTISAMPLE,       \
+         disable_angle_framebuffer_multisample)       \
+  GPU_OP(DISABLE_DEPTH_TEXTURE,                       \
+         disable_depth_texture)                       \
+  GPU_OP(DISABLE_EXT_OCCLUSION_QUERY,                 \
+         disable_ext_occlusion_query)                 \
+  GPU_OP(ENABLE_CHROMIUM_FAST_NPOT_MO8_TEXTURES,      \
+         enable_chromium_fast_npot_mo8_textures)      \
+  GPU_OP(EXIT_ON_CONTEXT_LOST,                        \
+         exit_on_context_lost)                        \
+  GPU_OP(FLUSH_ON_CONTEXT_SWITCH,                     \
+         flush_on_context_switch)                     \
+  GPU_OP(MAX_CUBE_MAP_TEXTURE_SIZE_LIMIT_1024,        \
+         max_cube_map_texture_size_limit_1024)        \
+  GPU_OP(MAX_CUBE_MAP_TEXTURE_SIZE_LIMIT_4096,        \
+         max_cube_map_texture_size_limit_4096)        \
+  GPU_OP(MAX_CUBE_MAP_TEXTURE_SIZE_LIMIT_512,         \
+         max_cube_map_texture_size_limit_512)         \
+  GPU_OP(MAX_TEXTURE_SIZE_LIMIT_4096,                 \
+         max_texture_size_limit_4096)                 \
+  GPU_OP(NEEDS_GLSL_BUILT_IN_FUNCTION_EMULATION,      \
+         needs_glsl_built_in_function_emulation)      \
+  GPU_OP(NEEDS_OFFSCREEN_BUFFER_WORKAROUND,           \
+         needs_offscreen_buffer_workaround)           \
+  GPU_OP(RESTORE_SCISSOR_ON_FBO_CHANGE,               \
+         restore_scissor_on_fbo_change)               \
+  GPU_OP(REVERSE_POINT_SPRITE_COORD_ORIGIN,           \
+         reverse_point_sprite_coord_origin)           \
+  GPU_OP(SET_TEXTURE_FILTER_BEFORE_GENERATING_MIPMAP, \
+         set_texture_filter_before_generating_mipmap) \
+  GPU_OP(USE_CLIENT_SIDE_ARRAYS_FOR_STREAM_BUFFERS,   \
+         use_client_side_arrays_for_stream_buffers)   \
+  GPU_OP(USE_CURRENT_PROGRAM_AFTER_SUCCESSFUL_LINK,   \
+         use_current_program_after_successful_link)
+
 namespace gpu {
 
-// Provides flags indicating which gpu features are blacklisted for the system
-// on which chrome is currently running.
-// If a bit is set to 1, corresponding feature is blacklisted.
+// Provides all types of GPU driver bug workarounds.
 enum GPU_EXPORT GpuDriverBugWorkaroundType {
-  CLEAR_ALPHA_IN_READPIXELS = 0,
-  CLEAR_UNIFORMS_BEFORE_PROGRAM_USE,
-  DELETE_INSTEAD_OF_RESIZE_FBO,
-  DISABLE_ANGLE_FRAMEBUFFER_MULTISAMPLE,
-  DISABLE_DEPTH_TEXTURE,
-  DISABLE_EXT_OCCLUSION_QUERY,
-  ENABLE_CHROMIUM_FAST_NPOT_MO8_TEXTURES,
-  EXIT_ON_CONTEXT_LOST,
-  FLUSH_ON_CONTEXT_SWITCH,
-  MAX_CUBE_MAP_TEXTURE_SIZE_LIMIT_1024,
-  MAX_CUBE_MAP_TEXTURE_SIZE_LIMIT_4096,
-  MAX_CUBE_MAP_TEXTURE_SIZE_LIMIT_512,
-  MAX_TEXTURE_SIZE_LIMIT_4096,
-  NEEDS_GLSL_BUILT_IN_FUNCTION_EMULATION,
-  NEEDS_OFFSCREEN_BUFFER_WORKAROUND,
-  RESTORE_SCISSOR_ON_FBO_CHANGE,
-  REVERSE_POINT_SPRITE_COORD_ORIGIN,
-  SET_TEXTURE_FILTER_BEFORE_GENERATING_MIPMAP,
-  USE_CLIENT_SIDE_ARRAYS_FOR_STREAM_BUFFERS,
-  USE_CURRENT_PROGRAM_AFTER_SUCCESSFUL_LINK,
+#define GPU_OP(type, name) type,
+  GPU_DRIVER_BUG_WORKAROUNDS(GPU_OP)
+#undef GPU_OP
   NUMBER_OF_GPU_DRIVER_BUG_WORKAROUND_TYPES
 };