Properly configure goma.

Everything is c/p from common.gypi.

Review URL: https://codereview.chromium.org/862973002

Cr-Commit-Position: refs/heads/master@{#26198}

build/standalone.gypi

@@ -65,11 +65,27 @@
       'host_arch%': '<(host_arch)',
       'target_arch%': '<(target_arch)',
       'v8_target_arch%': '<(target_arch)',
+
+      # goma settings.
+      # 1 to use goma.
+      # If no gomadir is set, it uses the default gomadir.
+      'use_goma%': 0,
+      'gomadir%': '',
+      'conditions': [
+        # Set default gomadir.
+        ['OS=="win"', {
+          'gomadir': 'c:\\goma\\goma-win',
+        }, {
+          'gomadir': '<!(/bin/echo -n ${HOME}/goma)',
+        }],
+      ],
     },
     'host_arch%': '<(host_arch)',
     'target_arch%': '<(target_arch)',
     'v8_target_arch%': '<(v8_target_arch)',
     'werror%': '-Werror',
+    'use_goma%': '<(use_goma)',
+    'gomadir%': '<(gomadir)',
 
     # .gyp files or targets should set v8_code to 1 if they build V8 specific
     # code, as opposed to external code.  This variable is used to control such
@@ -114,6 +130,16 @@
       }, {
         'os_posix%': 1,
       }],
+      ['OS=="win" and use_goma==1', {
+        # goma doesn't support pch yet.
+        'chromium_win_pch': 0,
+        # goma doesn't support PDB yet, so win_z7=1 or fastbuild=1.
+        'conditions': [
+          ['win_z7==0 and fastbuild==0', {
+            'fastbuild': 1,
+          }],
+        ],
+      }],
       ['(v8_target_arch=="ia32" or v8_target_arch=="x64" or v8_target_arch=="x87") and \
         (OS=="linux" or OS=="mac")', {
         'v8_enable_gdbjit%': 1,
@@ -475,5 +501,16 @@
         ['CC', '<(make_clang_dir)/bin/clang-cl'],
       ],
     }],
+    # TODO(yyanagisawa): supports GENERATOR==make
+    #  make generator doesn't support CC_wrapper without CC
+    #  in make_global_settings yet.
+    ['use_goma==1 and ("<(GENERATOR)"=="ninja" or clang==1)', {
+      'make_global_settings': [
+       ['CC_wrapper', '<(gomadir)/gomacc'],
+       ['CXX_wrapper', '<(gomadir)/gomacc'],
+       ['CC.host_wrapper', '<(gomadir)/gomacc'],
+       ['CXX.host_wrapper', '<(gomadir)/gomacc'],
+      ],
+    }],
   ],
 }