Add sRGB mode toggle to Viewer.

tools/viewer/sk_app/Window.cpp

Index: tools/viewer/sk_app/Window.cpp
diff --git a/tools/viewer/sk_app/Window.cpp b/tools/viewer/sk_app/Window.cpp
index a7fd6b0cf67d95a07042747142e2fd5580a0d5bf..47053be5afc5a503f398316238bdda317fd94ead 100644
--- a/tools/viewer/sk_app/Window.cpp
+++ b/tools/viewer/sk_app/Window.cpp
@@ -75,4 +75,12 @@ void Window::onResize(uint32_t w, uint32_t h) {
     fWindowContext->resize(w, h);
 }
 
+const DisplayParams& Window::getDisplayParams() {
+    return fWindowContext->getDisplayParams();
+}
+
+void Window::setDisplayParams(const DisplayParams& params) {
+    fWindowContext->setDisplayParams(params);
+}
+
 }   // namespace sk_app