components/metrics: Add runtime memory leak detector

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index e900cc4a6e72266d3c29f75608c6981acf567e28..8a59df6eb9cb5d0e8a78bfe88b279f5add4da1b2 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -1350,6 +1350,9 @@
     # Profile without optimizing out stack frames when profiling==1.
     'profiling_full_stack_frames%': '0',
 
+    # Enable automatic leak detector.
+    'leak_detector%': 0,
+
     # And if we want to dump symbols for Breakpad-enabled builds.
     'linux_dump_symbols%': 0,
     # And if we want to strip the binary after dumping symbols.
@@ -2696,6 +2699,9 @@
       ['profiling==1', {
         'defines': ['ENABLE_PROFILING=1'],
       }],
+      ['leak_detector==1 and chromeos==1', {
+        'defines': ['ENABLE_LEAK_DETECTOR=1'],
+      }],
       ['remoting==1', {
         'defines': ['ENABLE_REMOTING=1'],
       }],
@@ -3753,6 +3759,12 @@
                   'release_optimize%': 's',
                 },
               }],
+              ['leak_detector==1 and chromeos==1', {
+                'cflags': [
+                  '-fno-omit-frame-pointer',
+                  '-g',
+                ],
+              }],
               ['profiling==1', {
                 'cflags': [
                   '-fno-omit-frame-pointer',