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

tools/android/android_tools.gyp

Index: tools/android/android_tools.gyp
diff --git a/tools/android/android_tools.gyp b/tools/android/android_tools.gyp
index b290715962c87b4122dbc0ea79d60be9aedc0229..e48fc2924f8a028c0345c93e67c457b3f0ccf7f1 100644
--- a/tools/android/android_tools.gyp
+++ b/tools/android/android_tools.gyp
@@ -21,6 +21,7 @@
       ],
     },
     {
+      # GN: //tools/android:heap_profiler
       'target_name': 'heap_profiler',
       'type': 'none',
       'dependencies': [
@@ -29,6 +30,7 @@
       ],
     },
     {
+      # GN: //tools/android:memdump
       'target_name': 'memdump',
       'type': 'none',
       'dependencies': [
@@ -43,6 +45,7 @@
       ],
     },
     {
+      # GN: //tools/android:ps_ext
       'target_name': 'ps_ext',
       'type': 'none',
       'dependencies': [
@@ -50,6 +53,7 @@
       ],
     },
     {
+      # GN: //tools/android:customtabs_benchmark
       'target_name': 'customtabs_benchmark',
       'type': 'none',
       'dependencies': [