Add Chromium-style TimeDelta, Time and TimeTicks classes, and a new ElapsedTimer class.

tools/gyp/v8.gyp

Index: tools/gyp/v8.gyp
diff --git a/tools/gyp/v8.gyp b/tools/gyp/v8.gyp
index eefd142b7042040d7b6f298e37b8e4eeff57e0ac..4f5af11cb0e6df2f8410bd1c536e5c9223178e10 100644
--- a/tools/gyp/v8.gyp
+++ b/tools/gyp/v8.gyp
@@ -500,6 +500,9 @@
         '../../src/stub-cache.h',
         '../../src/sweeper-thread.h',
         '../../src/sweeper-thread.cc',
+        '../../src/time/elapsed-timer.h',
+        '../../src/time/time.cc',
+        '../../src/time/time.h',
         '../../src/token.cc',
         '../../src/token.h',
         '../../src/transitions-inl.h',
@@ -688,6 +691,9 @@
                   ]
                 }],
               ],
+              'libraries': [
+                '-lrt'
+              ]
             },
             'sources': [  ### gcmole(os:linux) ###
               '../../src/platform-linux.cc',
@@ -700,7 +706,7 @@
               'CAN_USE_VFP_INSTRUCTIONS',
             ],
             'sources': [
-              '../../src/platform-posix.cc',
+              '../../src/platform-posix.cc'
             ],
             'conditions': [
               ['host_os=="mac"', {
@@ -763,7 +769,7 @@
             ]},
             'sources': [
               '../../src/platform-solaris.cc',
-              '../../src/platform-posix.cc',
+              '../../src/platform-posix.cc'
             ],
           }
         ],
@@ -786,13 +792,13 @@
                 ['build_env=="Cygwin"', {
                   'sources': [
                     '../../src/platform-cygwin.cc',
-                    '../../src/platform-posix.cc',
+                    '../../src/platform-posix.cc'
                   ],
                 }, {
                   'sources': [
                     '../../src/platform-win32.cc',
-                    '../../src/win32-math.h',
                     '../../src/win32-math.cc',
+                    '../../src/win32-math.h'
                   ],
                 }],
               ],
@@ -802,8 +808,8 @@
             }, {
               'sources': [
                 '../../src/platform-win32.cc',
-                '../../src/win32-math.h',
                 '../../src/win32-math.cc',
+                '../../src/win32-math.h'
               ],
               'msvs_disabled_warnings': [4351, 4355, 4800],
               'link_settings':  {