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/BUILD.gn b/BUILD.gn
index 218a71a..408a682 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -82,7 +82,11 @@
     if (build_with_android) {
       cflags = [ "-DPERFETTO_BUILD_WITH_ANDROID" ]
       deps += [ "src/base:android_task_runner" ]
-      libs = [ "utils" ]
+      libs = [
+        "binder",
+        "services",
+        "utils",
+      ]
     }
   }