Create isolation target for WebView CTS tests and capture gn-paths arg in pydeps.

The isolation target will be used by swarming, the gn-paths arg was not being
captured in pydeps files generated with build/print_python_deps.py, but it is
needed by the isolation target to properly locate its depenencies.

Bug: 803245
Change-Id: I15bf4c8f7d1cd24a6ce1fcb4b44aeeff42786943
Reviewed-on: https://chromium-review.googlesource.com/1234340
Commit-Queue: Andrew Luo <[email protected]>
Reviewed-by: Changwan Ryu <[email protected]>
Reviewed-by: agrieve <[email protected]>
Reviewed-by: John Budorick <[email protected]>
Cr-Commit-Position: refs/heads/master@{#592899}
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index dd0a868..b41bee9 100644
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -638,6 +638,7 @@
 
 
 _ANDROID_SPECIFIC_PYDEPS_FILES = [
+    'android_webview/tools/run_cts.pydeps',
     'base/android/jni_generator/jni_generator.pydeps',
     'base/android/jni_generator/jni_registration_generator.pydeps',
     'build/android/gyp/aar.pydeps',