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

src/gpu/effects/GrGammaEffect.h

Index: src/gpu/effects/GrGammaEffect.h
diff --git a/src/gpu/effects/GrGammaEffect.h b/src/gpu/effects/GrGammaEffect.h
new file mode 100644
index 0000000000000000000000000000000000000000..e53ec29b2511053818727774c01f60c31b7a40a5
--- /dev/null
+++ b/src/gpu/effects/GrGammaEffect.h
@@ -0,0 +1,41 @@
+/*
+ * 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 GrGammaEffect_DEFINED
+#define GrGammaEffect_DEFINED
+
+#include "GrSingleTextureEffect.h"
+
+class GrGammaEffect : public GrSingleTextureEffect {
+public:
+    /**
+     * Creates an effect that applies a gamma curve.

[bsalomon, 2016/04/29 18:27:20]

Doc how src is sampled (always nearest)?

[Brian Osman, 2016/05/02 21:02:45]

Done.

+     */
+    static const GrFragmentProcessor* Create(GrTexture*, SkScalar gamma);
+
+    const char* name() const override { return "Gamma"; }
+
+    bool gammaIsSRGB() const { return fGammaIsSRGB; }
+    SkScalar gamma() const { return fGamma; }
+
+private:
+    GrGammaEffect(GrTexture*, SkScalar gamma);
+
+    GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;
+    void onGetGLSLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder*) const override;
+    bool onIsEqual(const GrFragmentProcessor&) const override;
+    void onComputeInvariantOutput(GrInvariantOutput* inout) const override;
+
+    bool fGammaIsSRGB;
+    SkScalar fGamma;
+
+    GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
+
+    typedef GrSingleTextureEffect INHERITED;
+};
+
+#endif