Add control of the sRGB global hack flag in SampleApp

samplecode/SampleApp.cpp

Index: samplecode/SampleApp.cpp
diff --git a/samplecode/SampleApp.cpp b/samplecode/SampleApp.cpp
index b7ba6f9580f85745e5b678399cd2eea24264a9b2..9c6b0d90c71192bd2c40eaea17c2ae95e7612438 100644
--- a/samplecode/SampleApp.cpp
+++ b/samplecode/SampleApp.cpp
@@ -23,6 +23,7 @@
 #include "SkPaintFilterCanvas.h"
 #include "SkPicture.h"
 #include "SkPictureRecorder.h"
+#include "SkPM4fPriv.h"
 #include "SkStream.h"
 #include "SkSurface.h"
 #include "SkTemplates.h"
@@ -935,6 +936,8 @@ SampleWindow::SampleWindow(void* hwnd, int argc, char** argv, DeviceManager* dev
     itemID = fAppMenu->appendList("ColorType", "ColorType", sinkID, 0,
                                   gConfig[0].fName, gConfig[1].fName, gConfig[2].fName, nullptr);
     fAppMenu->assignKeyEquivalentToItem(itemID, 'C');
+    itemID = fAppMenu->appendSwitch("sRGB SkColor", "sRGB SkColor", sinkID, gTreatSkColorAsSRGB);
+    fAppMenu->assignKeyEquivalentToItem(itemID, 'S');
 
     itemID = fAppMenu->appendList("Device Type", "Device Type", sinkID, 0,
                                   "Raster",
@@ -1650,7 +1653,8 @@ bool SampleWindow::onEvent(const SkEvent& evt) {
         SkOSMenu::FindListIndex(evt, "Hinting", &fHintingState) ||
         SkOSMenu::FindSwitchState(evt, "Clip", &fUseClip) ||
         SkOSMenu::FindSwitchState(evt, "Zoomer", &fShowZoomer) ||
-        SkOSMenu::FindSwitchState(evt, "Magnify", &fMagnify))
+        SkOSMenu::FindSwitchState(evt, "Magnify", &fMagnify) ||
+        SkOSMenu::FindSwitchState(evt, "sRGB SkColor", &gTreatSkColorAsSRGB))
     {
         this->inval(nullptr);
         this->updateTitle();
@@ -2159,6 +2163,10 @@ void SampleWindow::updateTitle() {
 
     title.appendf(" %s", find_config_name(this->info()));
 
+    if (gTreatSkColorAsSRGB) {
+        title.append(" sRGB");
+    }
+
     this->setTitle(title.c_str());
 }