update ANGLE docs for GN, current test tools

BUG=skia:

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4454
NOTRY=true
DOCS_PREVIEW= https://skia.org/?cl=4454

Change-Id: If9e5d763b599db358597e79e090f7a8aba618e10
Reviewed-on: https://skia-review.googlesource.com/4454
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>

diff --git a/site/user/special/angle.md b/site/user/special/angle.md
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+ANGLE
+=====
+
+Introduction
+------------
+
+ANGLE converts OpenGL ES 2 or 3 calls to DirectX 9, 11, or OpenGL calls. These
+instructions document how to use ANGLE instead of the native OpenGL backend on
+Windows or Linux.
+
+Details
+-------
+
+`gclient sync` downloads ANGLE's source alongside Skia's other test-only dependencies.
+
+To build Skia testing tools against ANGLE, add `skia_use_angle = true` to your
+`args.gn` file (or run `gn args` to edit it).
+
+When running tools, use `--config angle_<backend>_<frontend>`, e.g.
+
+    out/Debug/dm --src gm --config angle_d3d11_es2
+    out/Release/nanobench --config angle_gl_es2

diff --git a/site/user/special/windows_angle.md b/site/user/special/windows_angle.md
deleted file mode 100644 (file)
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-Using ANGLE on Windows
-======================
-
-Introduction
-------------
-
-ANGLE converts OpenGL ES 2.0 calls to DirectX 9 calls. These instructions
-document how to use ANGLE instead of the native OpenGL backend on Windows.
-
-Details
--------
-
-Angle is now downloaded as a part of Skia according to the `DEPS` file.
-
-Add `skia_angle=1` to your `GYP_DEFINES` environment variable.
-
-Run:
-
-    python gyp_skia
-
-Remember
---------
-
-In SampleApp you will need to use the 'D' key to get to the ANGLE backend unless you enable the `DEFAULT_TO_ANGLE` #define in `SampleApp.cpp`.
-
-  * Use “--angle” to enable ANGLE in gm.
-
-  * Use “--config ANGLE” to use ANGLE in bench.
-
-  * Use "--config angle" to use ANGLE in bench_pictures and render_pictures.
-
-ANGLE will automatically be compiled into the GLInterfaceValidation test.