CONTRIBUTING.md/ISSUE_TEMPLATE.md - Add --enable-gpu to list of command line args for cefclient

cefclient currently has GPU acceleration disabled by default, add --enable-gpu to list of args required for testing
when comparing with WPF version as CefSharp has it enabled by default.

untabify CONTRIBUTING.md

CONTRIBUTING.md

@@ -19,7 +19,7 @@ The upstream [`CEF` forum](http://magpcss.org/ceforum/) is a valuable resource,
 It maybe helpful to run the `cefclient` application and compare output with `CefSharp`. The `WinForms` and `WPF` versions use two different rendering modes, `WPF` uses Offscreen Rendering (`OSR`). `OffScreen` also uses `OSR` mode.
 
 - Download **Sample Application** from http://opensource.spotify.com/cefbuilds/index.html
-- To compare with WPF run `cefclient --multi-threaded-message-loop --off-screen-rendering-enabled`
+- To compare with WPF run `cefclient --multi-threaded-message-loop --off-screen-rendering-enabled --enable-gpu`
 - To compare with WinForms `cefclient --multi-threaded-message-loop`
 
 To determine which version of `CEF` your build is running, open `chrome://version` and you'll see a number similar to `3.2987.1597.gffc5773`. Open http://opensource.spotify.com/cefbuilds/index.html and download the `Sample Application` that exactly matches. If your using an older build click `Show More Builds`.
@@ -69,9 +69,9 @@ Change requests cover both architectural and functional changes to how `CefSharp
 
 1. **Use the GitHub search** and check someone else didn't get there first
 2. Take a moment to think about the best way to make a case for, and explain what you're thinking as it's up to you to convince the project's leaders the change is worthwhile. Some questions to consider are:
-	- Is it really one idea or is it many?
-	- What problem are you solving?
-	- Why is what you are suggesting better than what's already there?
+    - Is it really one idea or is it many?
+    - What problem are you solving?
+    - Why is what you are suggesting better than what's already there?
 
 ### Pull Requests/Feature Branches
 

ISSUE_TEMPLATE.md

@@ -47,7 +47,7 @@ e.g. 57.0.0 or 63.0.0-pre01
 
 - **Does this problem also occur in the `CEF` Sample Application from http://opensource.spotify.com/cefbuilds/index.html?**
 
-    - To compare with WPF run cefclient --multi-threaded-message-loop --off-screen-rendering-enabled
+    - To compare with WPF run cefclient --multi-threaded-message-loop --off-screen-rendering-enabled --enable-gpu
     - To compare with WinForms run cefclient --multi-threaded-message-loop
     - If you can reproduce the problem with `cefclient` then you'll need to report the bug on https://bitbucket.org/chromiumembedded/cef/overview there is no point opening an issue here. (Make sure you search before opening an issue)
     - Please include the version you tested with e.g. `cef_binary_3.3029.1611.g44e39a8_windows64_client.tar.bz2`