Implement DropBox uploading

This patch adds a --dropbox flag to the perfetto tool for uploading the
recorded trace file into DropBox.

Change-Id: I42ce9080292aa45f2442033a5c1d23c83e6e3855
diff --git a/tools/gen_android_bp b/tools/gen_android_bp
index 6b3b126..83ca6a3 100755
--- a/tools/gen_android_bp
+++ b/tools/gen_android_bp
@@ -58,7 +58,9 @@
 # Shared libraries which are directly translated to Android system equivalents.
 library_whitelist = [
     'android',
+    'binder',
     'log',
+    'services',
     'utils',
 ]