Android: allows using adb from a chromium checkout without envsetup.sh

build/android/pylib/__init__.py

Index: build/android/pylib/__init__.py
diff --git a/build/android/pylib/__init__.py b/build/android/pylib/__init__.py
index 727e987e6b621957ed56f20af1968525a9abadcf..ba6323e985981379c71c2e90295ea96e0f4c18c1 100644
--- a/build/android/pylib/__init__.py
+++ b/build/android/pylib/__init__.py
@@ -2,3 +2,18 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import os
+import subprocess
+
+
+if not os.environ.get('ANDROID_SDK_ROOT'):
+  # If envsetup.sh hasn't been sourced and there's no adb in the path,
+  # set it here.
+  with file(os.devnull, 'w') as devnull:
+    ret = subprocess.call(['which', 'adb'], stdout=devnull, stderr=devnull)
+    if ret:
+      print 'No adb found in $PATH, fallback to checked in binary.'
+      os.environ['PATH'] += os.pathsep + os.path.abspath(os.path.join(
+          os.path.dirname(__file__),
+          '..', '..', '..',
+          'third_party', 'android_tools', 'sdk', 'platform-tools'))