Add RGBA half float texture format.

src/gpu/GrDrawTarget.cpp

Index: src/gpu/GrDrawTarget.cpp
diff --git a/src/gpu/GrDrawTarget.cpp b/src/gpu/GrDrawTarget.cpp
index 2d80bcc8c3c89cc8fa612c42ce2311da0036a2c2..847e497dab3c587e0dde5580b21e962620554f86 100644
--- a/src/gpu/GrDrawTarget.cpp
+++ b/src/gpu/GrDrawTarget.cpp
@@ -734,6 +734,7 @@ SkString GrCaps::dump() const {
         "ASTC12x12",// kASTC_12x12_GrPixelConfig,
         "RGBAFloat",// kRGBA_float_GrPixelConfig
         "AlphaHalf",// kAlpha_half_GrPixelConfig
+        "RGBAHalf", // kRGBA_half_GrPixelConfig
     };
     GR_STATIC_ASSERT(0  == kUnknown_GrPixelConfig);
     GR_STATIC_ASSERT(1  == kAlpha_8_GrPixelConfig);
@@ -749,6 +750,7 @@ SkString GrCaps::dump() const {
     GR_STATIC_ASSERT(11 == kASTC_12x12_GrPixelConfig);
     GR_STATIC_ASSERT(12 == kRGBA_float_GrPixelConfig);
     GR_STATIC_ASSERT(13 == kAlpha_half_GrPixelConfig);
+    GR_STATIC_ASSERT(14 == kRGBA_half_GrPixelConfig);
     GR_STATIC_ASSERT(SK_ARRAY_COUNT(kConfigNames) == kGrPixelConfigCnt);
 
     SkASSERT(!fConfigRenderSupport[kUnknown_GrPixelConfig][0]);