Revert of Move SkGLContext and some GrGLInterface implementations to skgputest module

src/gpu/gl/mac/SkCreatePlatformGLContext_mac.cpp

Index: src/gpu/gl/mac/SkCreatePlatformGLContext_mac.cpp
diff --git a/src/gpu/gl/mac/SkCreatePlatformGLContext_mac.cpp b/src/gpu/gl/mac/SkCreatePlatformGLContext_mac.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..0ca62ad1ccaf91b3e985f6d10523e529e4e7cf31
--- /dev/null
+++ b/src/gpu/gl/mac/SkCreatePlatformGLContext_mac.cpp
@@ -0,0 +1,128 @@
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#include "SkTypes.h"
+#if defined(SK_BUILD_FOR_MAC)
+
+#include "gl/SkGLContext.h"
+#include "AvailabilityMacros.h"
+
+#include <OpenGL/OpenGL.h>
+#include <dlfcn.h>
+
+namespace {
+class MacGLContext : public SkGLContext {
+public:
+    MacGLContext();
+    ~MacGLContext() override;
+
+private:
+    void destroyGLContext();
+
+    void onPlatformMakeCurrent() const override;
+    void onPlatformSwapBuffers() const override;
+    GrGLFuncPtr onPlatformGetProcAddress(const char*) const override;
+
+    CGLContextObj fContext;
+    void* fGLLibrary;
+};
+
+MacGLContext::MacGLContext()
+    : fContext(nullptr)
+    , fGLLibrary(RTLD_DEFAULT) {
+    CGLPixelFormatAttribute attributes[] = {
+#if MAC_OS_X_VERSION_10_7
+        kCGLPFAOpenGLProfile, (CGLPixelFormatAttribute) kCGLOGLPVersion_3_2_Core,
+#endif
+        kCGLPFADoubleBuffer,
+        (CGLPixelFormatAttribute)0
+    };
+    CGLPixelFormatObj pixFormat;
+    GLint npix;
+
+    CGLChoosePixelFormat(attributes, &pixFormat, &npix);
+
+    if (nullptr == pixFormat) {
+        SkDebugf("CGLChoosePixelFormat failed.");
+        return;
+    }
+
+    CGLCreateContext(pixFormat, nullptr, &fContext);
+    CGLReleasePixelFormat(pixFormat);
+
+    if (nullptr == fContext) {
+        SkDebugf("CGLCreateContext failed.");
+        return;
+    }
+
+    CGLSetCurrentContext(fContext);
+
+    SkAutoTUnref<const GrGLInterface> gl(GrGLCreateNativeInterface());
+    if (nullptr == gl.get()) {
+        SkDebugf("Context could not create GL interface.\n");
+        this->destroyGLContext();
+        return;
+    }
+    if (!gl->validate()) {
+        SkDebugf("Context could not validate GL interface.\n");
+        this->destroyGLContext();
+        return;
+    }
+
+    fGLLibrary = dlopen(
+        "/System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib",
+        RTLD_LAZY);
+
+    this->init(gl.release());
+}
+
+MacGLContext::~MacGLContext() {
+    this->teardown();
+    this->destroyGLContext();
+}
+
+void MacGLContext::destroyGLContext() {
+    if (fContext) {
+        CGLReleaseContext(fContext);
+        fContext = nullptr;
+    }
+    if (RTLD_DEFAULT != fGLLibrary) {
+        dlclose(fGLLibrary);
+    }
+}
+
+void MacGLContext::onPlatformMakeCurrent() const {
+    CGLSetCurrentContext(fContext);
+}
+
+void MacGLContext::onPlatformSwapBuffers() const {
+    CGLFlushDrawable(fContext);
+}
+
+GrGLFuncPtr MacGLContext::onPlatformGetProcAddress(const char* procName) const {
+    return reinterpret_cast<GrGLFuncPtr>(dlsym(fGLLibrary, procName));
+}
+
+} // anonymous namespace
+
+SkGLContext* SkCreatePlatformGLContext(GrGLStandard forcedGpuAPI, SkGLContext* shareContext) {
+    SkASSERT(!shareContext);
+    if (shareContext) {
+        return nullptr;
+    }
+
+    if (kGLES_GrGLStandard == forcedGpuAPI) {
+        return nullptr;
+    }
+    MacGLContext* ctx = new MacGLContext;
+    if (!ctx->isValid()) {
+        delete ctx;
+        return nullptr;
+    }
+    return ctx;
+}
+
+#endif//defined(SK_BUILD_FOR_MAC)