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 70d2ec571f5181e5207aa9f2df232e9a5445eab8..d77e5011641a26a79b5e75292bcff2b5979aa899 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -1364,6 +1364,9 @@
     # 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.
@@ -2707,6 +2710,9 @@
       ['profiling==1', {
         'defines': ['ENABLE_PROFILING=1'],
       }],
+      ['leak_detector==1 and chromeos==1', {
+        'defines': ['ENABLE_LEAK_DETECTOR=1'],
+      }],
       ['remoting==1', {
         'defines': ['ENABLE_REMOTING=1'],
       }],
@@ -3815,6 +3821,11 @@
                   'release_optimize%': 's',
                 },
               }],
+              ['leak_detector==1 and chromeos==1', {
+                'cflags': [
+                  '-fno-omit-frame-pointer',
+                ],
+              }],
               ['profiling==1', {
                 'cflags': [
                   '-fno-omit-frame-pointer',