Revert of Move SkGLContext and some GrGLInterface implementations to skgputest module

src/gpu/gl/angle/GrGLCreateANGLEInterface.cpp

Index: src/gpu/gl/angle/GrGLCreateANGLEInterface.cpp
diff --git a/src/gpu/gl/angle/GrGLCreateANGLEInterface.cpp b/src/gpu/gl/angle/GrGLCreateANGLEInterface.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..48f9d8c8ffd7a2ade9ace06b02e2a997bd4bc3f5
--- /dev/null
+++ b/src/gpu/gl/angle/GrGLCreateANGLEInterface.cpp
@@ -0,0 +1,57 @@
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "gl/GrGLInterface.h"
+#include "gl/GrGLAssembleInterface.h"
+#include "../ports/SkOSLibrary.h"
+
+#include <EGL/egl.h>
+
+namespace {
+struct Libs {
+    void* fGLLib;
+    void* fEGLLib;
+};
+}
+
+static GrGLFuncPtr angle_get_gl_proc(void* ctx, const char name[]) {
+    const Libs* libs = reinterpret_cast<const Libs*>(ctx);
+    GrGLFuncPtr proc = (GrGLFuncPtr) GetProcedureAddress(libs->fGLLib, name);
+    if (proc) {
+        return proc;
+    }
+    proc = (GrGLFuncPtr) GetProcedureAddress(libs->fEGLLib, name);
+    if (proc) {
+        return proc;
+    }
+    return eglGetProcAddress(name);
+}
+
+const GrGLInterface* GrGLCreateANGLEInterface() {
+    static Libs gLibs = { nullptr, nullptr };
+
+    if (nullptr == gLibs.fGLLib) {
+        // We load the ANGLE library and never let it go
+#if defined _WIN32
+        gLibs.fGLLib = DynamicLoadLibrary("libGLESv2.dll");
+        gLibs.fEGLLib = DynamicLoadLibrary("libEGL.dll");
+#elif defined SK_BUILD_FOR_MAC
+        gLibs.fGLLib = DynamicLoadLibrary("libGLESv2.dylib");
+        gLibs.fEGLLib = DynamicLoadLibrary("libEGL.dylib");
+#else
+        gLibs.fGLLib = DynamicLoadLibrary("libGLESv2.so");
+        gLibs.fEGLLib = DynamicLoadLibrary("libEGL.so");
+#endif
+    }
+
+    if (nullptr == gLibs.fGLLib || nullptr == gLibs.fEGLLib) {
+        // We can't setup the interface correctly w/o the so
+        return nullptr;
+    }
+
+    return GrGLAssembleGLESInterface(&gLibs, angle_get_gl_proc);
+}