Implement input type=color UI (common part)

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index f3b8de473827313e0ea9d86d4ab3b4a79da9f259..eca3b2ab7f45160de7d9ed51cfc057534f262bea 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -225,6 +225,9 @@
       # Enable navigator.registerProtocolHandler and supporting UI.
       'enable_register_protocol_handler%': 1,
 
+      # Enable <input type=color> and supporting UI.
+      'enable_input_color%': 0,
+
       # Enable Web Intents and supporting UI.
       'enable_web_intents%': 0,
 
@@ -405,6 +408,7 @@
     'clang_use_chrome_plugins%': '<(clang_use_chrome_plugins)',
     'asan%': '<(asan)',
     'enable_register_protocol_handler%': '<(enable_register_protocol_handler)',
+    'enable_input_color%': '<(enable_input_color)',
     'enable_web_intents%': '<(enable_web_intents)',
     # Whether to build for Wayland display server
     'use_wayland%': 0,
@@ -869,6 +873,10 @@
         'grit_defines': ['-D', 'enable_register_protocol_handler'],
       }],
 
+      ['enable_input_color==1', {
+        'grit_defines': ['-D', 'enable_input_color'],
+      }],
+
       ['enable_web_intents==1', {
         'grit_defines': ['-D', 'enable_web_intents'],
       }],
@@ -1158,6 +1166,11 @@
           'ENABLE_REGISTER_PROTOCOL_HANDLER=1',
         ],
       }],
+      ['enable_input_color==1', {
+        'defines': [
+          'ENABLE_INPUT_COLOR=1',
+        ],
+      }],
       ['enable_web_intents==1', {
         'defines': [
           'ENABLE_WEB_INTENTS=1',