Implement Raster Backend on Android Viewer App

tools/viewer/Viewer.cpp

 /*
 * Copyright 2016 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
 #include "Viewer.h"
 
 #include "GMSlide.h"
@@ skipping 39 matching lines @@
                "^ requires the start of the bench to match\n"
                "$ requires the end of the bench to match\n"
                "^ and $ requires an exact match\n"
                "If a bench does not match any list entry,\n"
                "it is skipped unless some list entry starts with ~");
 DEFINE_string(skps, "skps", "Directory to read skps from.");
 DEFINE_bool(vulkan, true, "Run with Vulkan.");
 
 const char *kBackendTypeStrings[sk_app::Window::kBackendTypeCount] = {
     " [OpenGL]",
-    " [Vulkan]"
+    " [Vulkan]",
+    " [Raster]"
 };
 
 const char* kName = "name";
 const char* kValue = "value";
 const char* kOptions = "options";
 const char* kSlideStateName = "Slide";
 const char* kBackendStateName = "Backend";
 const char* kSoftkeyStateName = "Softkey";
 const char* kSoftkeyHint = "Please select a softkey";
 const char* kFpsStateName = "FPS";
@@ skipping 429 matching lines @@
         }
     } else if (stateName.equals(kSoftkeyStateName)) {
         if (!stateValue.equals(kSoftkeyHint)) {
             fCommands.onSoftkey(stateValue);
             updateUIState(); // This is still needed to reset the value to kSoftkeyHint
         }
     } else {
         SkDebugf("Unknown stateName: %s", stateName.c_str());
     }
 }