Trace VM service requests

runtime/bin/vmservice/client/HACKING.txt

Index: runtime/bin/vmservice/client/HACKING.txt
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+Dart Observatory Developer Guide
+---
+
+During development you do not need to run dart2js or rebuild the VM (unless
+you are also making changes to the backend). While you're working on your
+feature follow the steps:
+
+1. Open runtime/bin/vmservice/client in the Dart Editor
+2. Launch dart --enable-vm-service with a long running script in a terminal
+3. Launch web/index.html in Dartium
+
+At this point you should see the initial Observatory UI and that
+it is communicating with the VM you launched in step 2.
+
+Continue to develop and iterate until you're ready to upload your change
+for review. Upload your change and get an LGTM.
+
+4. Run dart build_.dart
+5. Run ./precommit.sh
+
+At this point you should rebuild your VM and using the build:
+
+6. Launch dart --enable-vm-service with a long running script.
+
+In a non-Dart enabled browser navigate to localhost:8181 and ensure
+that your feature works after being compiled to JavaScript.
+
+7. Commit your change
+