Added --deepColor option to SampleApp, triggers creation of a ten-bit/channel buffer on Windows.

experimental/iOSSampleApp/SkSampleUIView.mm

Index: experimental/iOSSampleApp/SkSampleUIView.mm
diff --git a/experimental/iOSSampleApp/SkSampleUIView.mm b/experimental/iOSSampleApp/SkSampleUIView.mm
index bd6d533cc839a1d3d27d6a2e1468da46219ca82b..8bf7c904e13a0b1362bc306744d9661a696964eb 100644
--- a/experimental/iOSSampleApp/SkSampleUIView.mm
+++ b/experimental/iOSSampleApp/SkSampleUIView.mm
@@ -47,7 +47,7 @@ public:
 #endif
     }
     
-    void setUpBackend(SampleWindow* win, int msaaSampleCount) override {
+    void setUpBackend(SampleWindow* win, int msaaSampleCount, bool deepColor) override {
         SkASSERT(SkOSWindow::kNone_BackEndType == fBackend);
         
         fBackend = SkOSWindow::kNone_BackEndType;
@@ -65,7 +65,7 @@ public:
                 break;
         }
         SkOSWindow::AttachmentInfo info;
-        bool result = win->attach(fBackend, msaaSampleCount, &info);
+        bool result = win->attach(fBackend, msaaSampleCount, false, &info);
         if (!result) {
             SkDebugf("Failed to initialize GL");
             return;
@@ -145,7 +145,7 @@ public:
         if (NULL != fCurContext) {
             SkOSWindow::AttachmentInfo info;
 
-            win->attach(fBackend, fMSAASampleCount, &info);
+            win->attach(fBackend, fMSAASampleCount, false, &info);
             
             glBindFramebuffer(GL_FRAMEBUFFER, fLayerFBO);
             GrBackendRenderTargetDesc desc;
@@ -177,7 +177,11 @@ public:
         return NULL;
 #endif
     }
-    
+
+    int getColorBits() override {
+        return 24;
+    }
+
     bool isUsingGL() const { return SkOSWindow::kNone_BackEndType != fBackend; }
     
 private: