android: Don't require aapt to be on the path during builds and tests.

build/android/adb_install_apk.py

Index: build/android/adb_install_apk.py
diff --git a/build/android/adb_install_apk.py b/build/android/adb_install_apk.py
index adad48bdef84a445d58e3f443017b979302706d4..d3a82fec151660db6e15a86449ccc52756e87b22 100755
--- a/build/android/adb_install_apk.py
+++ b/build/android/adb_install_apk.py
@@ -63,7 +63,8 @@ def main(argv):
     raise Exception('Error: no connected devices')
 
   if not options.apk_package:
-    options.apk_package = apk_helper.GetPackageName(options.apk)
+    options.apk_package = apk_helper.GetPackageName(constants.ANDROID_SDK_TOOLS,
+                                                    options.apk)
 
   pool = multiprocessing.Pool(len(devices))
   # Send a tuple (apk_path, apk_package, device) per device.