Added doc for local profiling on android with screenshots

docs-user/_sidebar.md

@@ -5,7 +5,9 @@
   * [Profiler Fundamentals](./guide-profiler-fundamentals.md)
   * [Stack samples and call trees](./guide-stack-samples-and-call-trees.md)
   * [Filtering call trees](./guide-filtering-call-trees.md)
-  * [Remote Profiling Firefox for Android](./guide-remote-profiling.md)
+  * [Profiling Firefox for Android](./guide-profiling-firefox-android.md)
+    * [Remote Profiling](./guide-remote-profiling.md)
+    * [Profiling directly on the device](./guide-profiling-android-directly-on-device.md)
   * [Memory Allocations](./memory-allocations.md)
 * [Advanced Topics](./advanced-topics.md)
   * [Profiling Firefox Startup & Shutdown](./guide-startup-shutdown.md)

docs-user/guide-profiling-android-directly-on-device.md

@@ -0,0 +1,34 @@
+# Profiling Firefox for Android directly on device
+
+The Firefox Profiler can be used without the remote debugging option. It offers a little less flexibility (can't edit the options and the profile is 
+automatically uploaded). However, it does allow you to capture a profile without the need of a PC.
+
+## Setup
+
+### Pick a build to profile
+We recommend profiling a Firefox build from any release channel (i.e. not debug), whether downloaded from Google Play, Taskcluster, or built locally.
+
+### Enable secret settings on the mobile device
+
+To enable secret settings, follow these steps:
+
+ - Click on the [three dot icon next to the URL bar](./images/about-url.png)
+ - Select the ["Settings" option](./images/settings-menu.png).
+ - Scroll to the bottom of the settings page and select the "About Firefox"
+ - Click the "Firefox" logo 5 times. [A toast should appear at the bottom of your screen with the number of click left before unlocking the secret menu](./images/secret-menu-toast.png).
+ - Go back to the "Settings" screen and scroll to the bottom where you should see the ["Start Profiler" option](./images/start-profiler.png).
+
+## Usage instructions
+
+### To start the profiler
+
+ - Click on "Start Profiler" and you should see a dialogue appear.
+ - Choose one of the four options that matches the closest to what you're trying to profile.
+ - Click "Start Profiler" and a toast should appear with the "Profiler started" message.
+
+### To stop the profiler
+
+  - Go back to the Settings screen
+  - Scroll to the bottom and you should see a "Stop profiler" option has replaced the "Start Profiler" one.
+  - After you click it, you should see a dialogue with a warning regarding the information contained in the profile.
+  - Once stopped, the URL for the profile that finished recording will be copied to your clipboard which you can then use to share.

docs-user/guide-profiling-firefox-android.md

@@ -0,0 +1,7 @@
+# Profiling Firefox for Android
+
+Two options are possible:
+
+* [Remote Profiling Firefox for Android](./guide-remote-profiling.md) provides the most options but can be cumbersome to set up;
+* [Profiling Firefox for Android directly on the device](./guide-profiling-android-directly-on-device.md) has fewer options but should be easier to set up.
+