Refactor common unit test code.

src/test/test.gyp

Index: src/test/test.gyp
diff --git a/src/heap/heap.gyp b/src/test/test.gyp
similarity index 64%
copy from src/heap/heap.gyp
copy to src/test/test.gyp
index 2970eb8a43b7d78af308ec2d807c0cb44fad956d..f4c6a5e46997334ed1afbdcf848865fb6bddec37 100644
--- a/src/heap/heap.gyp
+++ b/src/test/test.gyp
@@ -9,22 +9,31 @@
   'includes': ['../../build/toolchain.gypi', '../../build/features.gypi'],
   'targets': [
     {
-      'target_name': 'heap-unittests',
-      'type': 'executable',
+      'target_name': 'run-all-unittests',
+      'type': 'static_library',
+      'variables': {
+        'optimize': 'max',
+      },
       'dependencies': [
+        '../../testing/gmock.gyp:gmock',
         '../../testing/gtest.gyp:gtest',
-        '../../testing/gtest.gyp:gtest_main',
         '../../tools/gyp/v8.gyp:v8_libplatform',
       ],
       'include_dirs': [
         '../..',
       ],
       'sources': [  ### gcmole(all) ###
-        'gc-idle-time-handler-unittest.cc',
+        'run-all-unittests.cc',
+        'test-utils.h',
+        'test-utils.cc',
+      ],
+      'export_dependent_settings': [
+        '../../testing/gmock.gyp:gmock',
+        '../../testing/gtest.gyp:gtest',
       ],
       'conditions': [
         ['component=="shared_library"', {
-          # heap-unittests can't be built against a shared library, so we
+          # compiler-unittests can't be built against a shared library, so we
           # need to depend on the underlying static target in that case.
           'conditions': [
             ['v8_use_snapshot=="true"', {
@@ -45,6 +54,16 @@
           'cflags!': [
             '-pedantic',
           ],
+          'direct_dependent_settings': {
+            'cflags!': [
+              '-pedantic',
+            ],
+          },
+        }],
+        ['want_separate_host_toolset==1', {
+          'toolsets': ['host', 'target'],
+        }, {
+          'toolsets': ['target'],
         }],
       ],
     },