Only generate GPU json data entries related to a given platform at build time.

gpu/config/process_json.py

Index: gpu/config/process_json.py
diff --git a/gpu/config/process_json.py b/gpu/config/process_json.py
index 05ec4a26e172948a6c59b41f1c18d39780ba954b..648fb067010020c355d7d3387cec6dda080e6264 100755
--- a/gpu/config/process_json.py
+++ b/gpu/config/process_json.py
@@ -500,7 +500,7 @@ def write_entry_more_data(entry_id, is_exception, exception_id, gl_type,
 
 
 def write_entry(entry, total_feature_set, feature_name_prefix,
-                  data_file, data_helper_file, data_exception_file):
+                data_file, data_helper_file, data_exception_file):
   data_file.write('{\n')
   # ID
   entry_id = entry['id']
@@ -582,7 +582,7 @@ def process_json_file(json_filepath, list_tag,
                       feature_header_filename, total_features, feature_tag,
                       output_header_filepath, output_data_filepath,
                       output_helper_filepath, output_exception_filepath, path,
-                      export_tag, git_format):
+                      export_tag, git_format, os_filter):
   output_header_filename = os.path.basename(output_header_filepath)
   output_helper_filename = os.path.basename(output_helper_filepath)
   output_exception_filename = os.path.basename(output_exception_filepath)
@@ -611,20 +611,22 @@ def process_json_file(json_filepath, list_tag,
   data_file.write('namespace gpu {\n\n')
   data_file.write('const char k%sVersion[] = "%s";\n\n' %
                   (list_tag, json_data['version']))
-  entry_count = len(json_data['entries'])
-  data_file.write('const size_t k%sEntryCount = %d;\n' %
-                  (list_tag, entry_count))
-  data_file.write('const GpuControlList::Entry k%sEntries[%d] = {\n' %
-                  (list_tag, entry_count))
+  data_file.write('const GpuControlList::Entry k%sEntries[] = {\n' % list_tag)
   ids = []
-  for index in range(entry_count):
+  entry_count = 0
+  for index in range(len(json_data['entries'])):
     entry = json_data['entries'][index]
     entry_id = entry['id']
     assert entry_id not in ids
     ids.append(entry_id)
+    if os_filter != None and 'os' in entry and entry['os']['type'] != os_filter:
+      continue
+    entry_count += 1
     write_entry(entry, total_features, feature_tag,
                 data_file, data_helper_file, data_exception_file)
   data_file.write('};\n')
+  data_file.write('const size_t k%sEntryCount = %d;\n' %
+                  (list_tag, entry_count))
   data_file.write('}  // namespace gpu\n')
   data_file.close()
   data_helper_file.write('}  // namespace gpu\n')
@@ -658,7 +660,7 @@ def process_json_file(json_filepath, list_tag,
                   output_helper_filepath, output_exception_filepath])
 
 
-def process_software_rendering_list(script_dir, output_dir):
+def process_software_rendering_list(script_dir, output_dir, os_filter):
   total_features = load_software_rendering_list_features(
       os.path.join(script_dir, 'gpu_feature_type.h'))
   process_json_file(
@@ -674,10 +676,11 @@ def process_software_rendering_list(script_dir, output_dir):
       os.path.join(output_dir, 'software_rendering_list_exceptions_autogen.h'),
       'gpu/config',
       'GPU_EXPORT ',
-      False)
+      False,
+      os_filter)
 
 
-def process_gpu_driver_bug_list(script_dir, output_dir):
+def process_gpu_driver_bug_list(script_dir, output_dir, os_filter):
   total_features = load_gpu_driver_bug_workarounds(
       os.path.join(script_dir, 'gpu_driver_bug_workaround_type.h'))
   process_json_file(
@@ -693,7 +696,8 @@ def process_gpu_driver_bug_list(script_dir, output_dir):
       os.path.join(output_dir, 'gpu_driver_bug_list_exceptions_autogen.h'),
       'gpu/config',
       'GPU_EXPORT ',
-      False)
+      False,
+      os_filter)
 
 
 def process_gpu_control_list_testing(script_dir, output_dir):
@@ -711,7 +715,8 @@ def process_gpu_control_list_testing(script_dir, output_dir):
       os.path.join(output_dir, 'gpu_control_list_testing_exceptions_autogen.h'),
       'gpu/config',
       '',
-      True)
+      True,
+      None)
 
 
 def process_gpu_data_manager_testing(script_dir, output_dir):
@@ -730,7 +735,8 @@ def process_gpu_data_manager_testing(script_dir, output_dir):
       os.path.join(output_dir, 'gpu_data_manager_testing_exceptions_autogen.h'),
       'content/browser/gpu',
       '',
-      True)
+      True,
+      None)
 
 
 def write_test_entry_enums(input_json_filepath, output_entry_enums_filepath,
@@ -771,13 +777,17 @@ def main(argv):
   parser.add_option("--skip-testing-data", action="store_false",
                     dest="generate_testing_data", default=True,
                     help="skip testing data generation.")
+  parser.add_option("--os-filter",
+                    help="only output entries applied to the specified os.")
   (options, args) = parser.parse_args(args=argv)
 
   script_dir = os.path.dirname(os.path.realpath(__file__))
 
   if options.output_dir != None:
-    process_software_rendering_list(script_dir, options.output_dir)
-    process_gpu_driver_bug_list(script_dir, options.output_dir)
+    process_software_rendering_list(
+        script_dir, options.output_dir, options.os_filter)
+    process_gpu_driver_bug_list(
+        script_dir, options.output_dir, options.os_filter)
 
   if options.generate_testing_data:
     # Testing data files are generated by calling the script manually.