[build] Add build options for uftrace support

gypfiles/standalone.gypi

Index: gypfiles/standalone.gypi
diff --git a/gypfiles/standalone.gypi b/gypfiles/standalone.gypi
index d438a5aeab992e3d09e86c109e1944829218a8e5..0626e8995c42134f0ddda447190c00a66b8dbcf5 100644
--- a/gypfiles/standalone.gypi
+++ b/gypfiles/standalone.gypi
@@ -114,6 +114,8 @@
       'v8_target_arch%': '<(target_arch)',
       'coverage%': '<(coverage)',
       'sysroot%': '<(sysroot)',
+      'pg%': 0,
+      'finstrument%': 0,
       'asan%': 0,
       'lsan%': 0,
       'msan%': 0,
@@ -194,6 +196,8 @@
     'werror%': '-Werror',
     'use_goma%': '<(use_goma)',
     'gomadir%': '<(gomadir)',
+    'pg%': '<(pg)',
+    'finstrument%': '<(finstrument)',
     'asan%': '<(asan)',
     'lsan%': '<(lsan)',
     'msan%': '<(msan)',
@@ -594,6 +598,37 @@
     ['os_posix==1 and OS!="mac"', {
       'target_defaults': {
         'conditions': [
+          # Binaries compiled with -pg option can be traced with uftrace.
+          ['pg==1', {
+            'target_conditions': [
+              ['_toolset=="target"', {
+                'cflags': [
+                  '-pg',
+                  '-fno-omit-frame-pointer',
+                ],
+                'ldflags': [
+                  '-pg',
+                  '-fno-omit-frame-pointer',
+                ],
+              }],
+            ],
+          }],
+          # Binaries compiled with -finstrument-functions option can be traced
+          # with uftrace.
+          ['finstrument==1', {
+            'target_conditions': [
+              ['_toolset=="target"', {
+                'cflags': [
+                  '-finstrument-functions',
+                  '-fno-omit-frame-pointer',
+                ],
+                'ldflags': [
+                  '-finstrument-functions',
+                  '-fno-omit-frame-pointer',
+                ],
+              }],
+            ],
+          }],
           # Common options for AddressSanitizer, LeakSanitizer,
           # ThreadSanitizer, MemorySanitizer and CFI builds.
           ['asan==1 or lsan==1 or tsan==1 or msan==1 or cfi_vptr==1', {