[Android] Add blink_{heap,platform}_unittests to M64 & trial bots.

testing/buildbot/chromium.android.json

 {
   "Android Aura Tester (dbg)": {
     "gtest_tests": [
       {
         "test": "base_unittests"
       },
       {
         "test": "compositor_unittests"
       },
       {
@@ skipping 835 matching lines @@
         "args": [
           "--isolate_file_path=src/base/base_unittests.isolate"
         ],
         "test": "base_unittests"
       },
       {
         "test": "blimp_unittests"
       },
       {
         "args": [
+          "--isolate_file_path=src/third_party/WebKit/Source/platform/heap/BlinkHeapUnitTests.isolate"
+        ],
+        "test": "blink_heap_unittests"
+      },
+      {
+        "test": "blink_platform_unittests"
+      },
+      {
+        "args": [
           "--isolate_file_path=src/breakpad/breakpad_unittests.isolate"
         ],
         "override_compile_targets": [
           "breakpad_unittests_deps"
         ],
         "test": "breakpad_unittests"
       },
       {
         "test": "cc_unittests"
       },
@@ skipping 201 matching lines @@
       },
       {
         "args": [
           "--isolate_file_path=src/chrome/unit_tests.isolate"
         ],
         "test": "unit_tests"
       }
     ]
   }
 }