Add sRGB mode toggle to Viewer.

tools/viewer/sk_app/android/Window_android.h

 /*
 * Copyright 2016 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
 #ifndef Window_android_DEFINED
 #define Window_android_DEFINED
 
@@ skipping 13 matching lines @@
 public:
     Window_android() : Window() {}
     ~Window_android() override {}
 
     bool init(android_app* app_state);
     void initDisplay(ANativeWindow* window);
 
     void setTitle(const char*) override;
     void show() override {}
 
-    bool attach(BackEndType attachType, int msaaSampleCount, bool deepColor) override;
+    bool attach(BackEndType attachType, const DisplayParams& params) override;
     void inval() override;
 
     void paintIfNeeded();
 
     bool scaleContentToFit() const override { return true; }
     bool supportsContentRect() const override { return true; }
     SkRect getContentRect() override { return mContentRect; }
     void setContentRect(int l, int t, int r, int b) { mContentRect.set(l,t,r,b); }
 
 private:
     android_app* mApp = nullptr;
     SkRect mContentRect;
-    int mSampleCount = 0;
+    DisplayParams fDisplayParams;
 };
 
 }   // namespace sk_app
 
 #endif