Add android_launch_app script to allow command line options to be passed to the sampleApp when star…

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 Android
 =======
 
 Prerequisites
 -------------
 
 _Currently we only support building Skia for Android on a Linux or Mac host!_
 
 The following libraries/utilities are required in addition to those needed for a standard skia checkout:
 
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 The SampleApp on Android provides a simple UI for viewing sample slides and gm images.
 
     BUILDTYPE=Debug ./platform_tools/android/bin/android_ninja -d $TARGET_DEVICE
 
 Then, install the app onto the device:
 
     ./platform_tools/android/bin/android_install_app
 
-Finally to run the application you must navigate to the Skia Samples
-application using the application launcher on your device.
+Finally to run the application you can either navigate to the Skia Samples
+application using the application launcher on your device or from the command
+line.  The command line option allows you to pass additional details to the
+application (similiar to other operating system) that specify where to find
+skp files and other resources.
+
+    ./platform_tools/android/bin/android_launch_app --resourcePath /data/local/tmp/resources
+
+By default if no additional parameters are specified the app will use the default
+params...
+
+    --resourcePath /data/local/tmp/skia_resoures 
+    --pictureDir /data/local/tmp/skia_skp
 
 Build tools
 -----------
 
 The Android platform does not support skdiff at this time.
 
 Clean up all generated files
 ----------------------------
 
     make clean
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     # include additional arguments in quotes (e.g. "dm --nopdf")
     ./platform_tools/android/bin/android_gdb_native dm
     
     # SAMPLE APP
     # make sure you've installed the app on the device first
     ./platform_tools/android/bin/android_gdb_app
 
 When the gdb client is ready, insert a breakpoint, and continue to let the
 program resume execution.