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

testing/buildbot/chromium.fyi.json

 {
   "Android Cloud Tests": {
     "gtest_tests": [
       {
         "test": "android_webview_unittests"
       },
       {
         "test": "base_unittests"
       },
       {
@@ skipping 61 matching lines @@
       },
       {
         "test": "ui_touch_selection_unittests"
       },
       {
         "test": "unit_tests"
       }
     ]
   },
   "Android Tests (trial)(dbg)": {
+    "gtest_tests": [
+      {
+        "args": [
+          "--isolate_file_path=src/third_party/WebKit/Source/platform/heap/BlinkHeapUnitTests.isolate"
+        ],
+        "test": "blink_heap_unittests"
+      },
+      {
+        "test": "blink_platform_unittests"
+      }
+    ],
     "scripts": [
       {
         "name": "telemetry_unittests",
         "script": "telemetry_unittests.py"
       }
     ]
   },
   "Android User Builder Tests": {
     "gtest_tests": [
       {
@@ skipping 5708 matching lines @@
       },
       {
         "args": [
           "--isolate-extensions"
         ],
         "test": "unit_tests"
       }
     ]
   }
 }