Use common display initialization logic for Unix

src/gpu/gl/glx/GrNativeDisplay_glx.h

Index: src/gpu/gl/glx/GrNativeDisplay_glx.h
diff --git a/src/gpu/gl/glx/GrNativeDisplay_glx.h b/src/gpu/gl/glx/GrNativeDisplay_glx.h
new file mode 100644
index 0000000000000000000000000000000000000000..a24c9c104a06e50b7114437097e174d7a74aaf2c
--- /dev/null
+++ b/src/gpu/gl/glx/GrNativeDisplay_glx.h
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ */
+

[robertphillips, 2015/10/16 14:54:40]

GrNativeDisplay_glx_DEFINED ?

+#ifndef GrNativeDrawable_glx_DEFINED
+#define GrNativeDrawable_glx_DEFINED
+
+#include <GL/glx.h>
+
+namespace GrNativeDisplay {

[bsalomon, 2015/10/15 20:55:27]

Wondering why a namespace and generic function name. Is the idea to different
implementations of GrNativeDislay::Initialize with different params for
different display systems? 

Wondering if it should just be GrGLX.h with a function GrInitializeGLX()? 

+

[robertphillips, 2015/10/16 14:54:40]

// Iterate through all the configs compatible with 'visualAttribs' and return
// the best in 'bestConfig'. In this case best means supporting the most
// MSAA samples.

?

+bool Initialize(int* visualAttribs, Display*, GLXFBConfig* outBestConfig);
+
+};
+
+#endif