Port most of the remainder of //tools/android from GYP to GN

tools/android/android_tools.gyp

 # Copyright (c) 2012 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': [
     # Intermediate target grouping the android tools needed to run native
     # unittests and instrumentation test apks.
     {
       # GN: //tools/android:android_tools
       'target_name': 'android_tools',
       'type': 'none',
       'dependencies': [
         'adb_reboot/adb_reboot.gyp:adb_reboot',
         'file_poller/file_poller.gyp:file_poller',
         'forwarder2/forwarder.gyp:forwarder2',
         'md5sum/md5sum.gyp:md5sum',
         'purge_ashmem/purge_ashmem.gyp:purge_ashmem',
         'run_pie/run_pie.gyp:run_pie',
         '../../tools/telemetry/telemetry.gyp:*#host',
       ],
     },
     {
+      # GN: //tools/android:heap_profiler
       'target_name': 'heap_profiler',
       'type': 'none',
       'dependencies': [
         'heap_profiler/heap_profiler.gyp:heap_dump',
         'heap_profiler/heap_profiler.gyp:heap_profiler',
       ],
     },
     {
+      # GN: //tools/android:memdump
       'target_name': 'memdump',
       'type': 'none',
       'dependencies': [
         'memdump/memdump.gyp:memdump',
       ],
     },
     {
       'target_name': 'memconsumer',
       'type': 'none',
       'dependencies': [
         'memconsumer/memconsumer.gyp:memconsumer',
       ],
     },
     {
+      # GN: //tools/android:ps_ext
       'target_name': 'ps_ext',
       'type': 'none',
       'dependencies': [
         'ps_ext/ps_ext.gyp:ps_ext',
       ],
     },
     {
+      # GN: //tools/android:customtabs_benchmark
       'target_name': 'customtabs_benchmark',
       'type': 'none',
       'dependencies': [
         'customtabs_benchmark/customtabs_benchmark.gyp:customtabs_benchmark_apk',
       ],
     },
   ],
 }