[Android] Make the adb path configurable in three scripts.

build/android/provision_devices.py

Index: build/android/provision_devices.py
diff --git a/build/android/provision_devices.py b/build/android/provision_devices.py
index 5f8fce274e6cd15bf6367ad701b80072b4719ab6..a9c6cd8d192bb14883b95c51d99a33813e62eae7 100755
--- a/build/android/provision_devices.py
+++ b/build/android/provision_devices.py
@@ -22,6 +22,7 @@ import sys
 import time
 
 import devil_chromium
+from devil import devil_env
 from devil.android import battery_utils
 from devil.android import device_blacklist
 from devil.android import device_errors
@@ -470,6 +471,8 @@ def main():
   parser.add_argument('-d', '--device', metavar='SERIAL',
                       help='the serial number of the device to be provisioned'
                       ' (the default is to provision all devices attached)')
+  parser.add_argument('--adb-path',
+                      help='Absolute path to the adb binary to use.')
   parser.add_argument('--blacklist-file', help='Device blacklist JSON file.')
   parser.add_argument('--phase', action='append', choices=_PHASES.ALL,
                       dest='phases',
@@ -519,7 +522,15 @@ def main():
 
   run_tests_helper.SetLogLevel(args.verbose)
 
-  devil_chromium.Initialize()
+  devil_custom_deps = None
+  if args.adb_path:
+    devil_custom_deps = {
+      'adb': {
+        devil_env.GetPlatform(): [args.adb_path],
+      },
+    }
+
+  devil_chromium.Initialize(custom_deps=devil_custom_deps)
 
   return ProvisionDevices(args)