[Android] Introduce libheap_profiler for memory profiling.

tools/android/heap_profiler/heap_profiler.gyp

+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+{
+  'targets': [
+    {
+      # libheap_profiler is the library which will be preloaded in the Zygote /
+      # target process and contains the black magic to hook malloc/mmap calls.
+      'target_name': 'heap_profiler',
+      'type': 'shared_library',
+      'sources': [
+        'heap_profiler_hooks_android.c',
+      ],
+      'include_dirs': ['../../..'],
+      'dependencies': ['heap_profiler_core'],
+    },
+    {
+      # heap_profiler_core contains only the tracking metadata code without any
+      # hooks. It is required by both the hprof library itself and the unittest.
+      'target_name': 'heap_profiler_core',
+      'type': 'static_library',
+      'sources': [
+        'heap_profiler.c',
+        'heap_profiler.h',
+      ],
+      'include_dirs': ['../../..'],
+    },
+    {
+      'target_name': 'hdump',
+      'type': 'executable',
+      'sources': ['hdump.c'],
+    },
+    {
+      'target_name': 'heap_profiler_unittest',
+      'type': '<(gtest_target_type)',
+      'sources': ['heap_profiler_unittest.cc'],
+      'dependencies': [
+        'heap_profiler_core',
+        '../../../testing/gtest.gyp:gtest',
+      ],
+      'include_dirs': ['../../..'],
+      'conditions': [
+        ['OS == "android"',
+          {
+            'dependencies': [
+              '../../../testing/android/native_test.gyp:native_test_native_code',
+            ],
+          }
+        ],
+      ]
+    },
+  ],
+  'conditions': [
+    ['OS == "android"', {
+      'targets': [
+        {
+          'target_name': 'heap_profiler_unittest_apk',
+          'type': 'none',
+          'dependencies': ['heap_profiler_unittest'],
+          'variables': {
+            'test_suite_name': 'heap_profiler_unittest',
+          },
+          'includes': [ '../../../build/apk_test.gypi' ],
+        },
+      ],
+    }],
+  ],
+}