Revert of Add OpenGL context to Viewer.

tools/viewer/Viewer.cpp

Index: tools/viewer/Viewer.cpp
diff --git a/tools/viewer/Viewer.cpp b/tools/viewer/Viewer.cpp
index 644dd22e5e92723be0a6305ef0af80e21e3dd1e5..7dd265e6e2183cd75c4e726410be8a845aa12d41 100644
--- a/tools/viewer/Viewer.cpp
+++ b/tools/viewer/Viewer.cpp
@@ -41,15 +41,9 @@
                "it is skipped unless some list entry starts with ~");
 DEFINE_string(skps, "skps", "Directory to read skps from.");
 
-const char *kBackendTypeStrings[sk_app::Window::kBackendTypeCount] = {
-    " [OpenGL]",
-    " [Vulkan]"
-};
-
 Viewer::Viewer(int argc, char** argv, void* platformData)
     : fCurrentMeasurement(0)
     , fDisplayStats(false)
-    , fBackendType(sk_app::Window::kVulkan_BackendType)
     , fZoomCenterX(0.0f)
     , fZoomCenterY(0.0f)
     , fZoomLevel(0.0f)
@@ -66,7 +60,7 @@
     SkCommandLineFlags::Parse(argc, argv);
 
     fWindow = Window::CreateNativeWindow(platformData);
-    fWindow->attach(fBackendType, DisplayParams());
+    fWindow->attach(Window::kVulkan_BackendType, DisplayParams());
 
     // register callbacks
     fCommands.attach(fWindow);
@@ -109,22 +103,6 @@
         this->changeZoomLevel(-1.f / 32.f);
         fWindow->inval();
     });
-#ifndef SK_BUILD_FOR_ANDROID
-    fCommands.addCommand('d', "Modes", "Change rendering backend", [this]() {
-        fWindow->detach();
-
-        if (sk_app::Window::kVulkan_BackendType == fBackendType) {
-            fBackendType = sk_app::Window::kNativeGL_BackendType;
-        } 
-        // TODO: get Vulkan -> OpenGL working without swapchain creation failure
-        //else if (sk_app::Window::kNativeGL_BackendType == fBackendType) {
-        //    fBackendType = sk_app::Window::kVulkan_BackendType;
-        //}
-
-        fWindow->attach(fBackendType, DisplayParams());
-        this->updateTitle();
-    });
-#endif
 
     // set up slides
     this->initSlides();
@@ -201,7 +179,6 @@
     if (kSRGB_SkColorProfileType == fWindow->getDisplayParams().fProfileType) {
         title.append(" sRGB");
     }
-    title.append(kBackendTypeStrings[fBackendType]);
     fWindow->setTitle(title.c_str());
 }
 
@@ -256,6 +233,7 @@
 }
 
 void Viewer::onPaint(SkCanvas* canvas) {
+
     int count = canvas->save();
 
     if (fWindow->supportsContentRect()) {