Add RGBA half float texture format.

include/gpu/GrColor.h

Index: include/gpu/GrColor.h
diff --git a/include/gpu/GrColor.h b/include/gpu/GrColor.h
index 43bfd8dc11e0aa104d83c4c998efc4e50909f202..f5757b93f5e902c8f3d94a8b3a045b37f5c580f2 100644
--- a/include/gpu/GrColor.h
+++ b/include/gpu/GrColor.h
@@ -183,6 +183,7 @@ static inline uint32_t GrPixelConfigComponentMask(GrPixelConfig config) {
         kRGBA_GrColorComponentFlags,    // kASTC_12x12_GrPixelConfig
         kRGBA_GrColorComponentFlags,    // kRGBA_float_GrPixelConfig
         kA_GrColorComponentFlag,        // kAlpha_16_GrPixelConfig
+        kRGBA_GrColorComponentFlags,    // kRGBA_half_GrPixelConfig
     };
     return kFlags[config];
 
@@ -200,6 +201,7 @@ static inline uint32_t GrPixelConfigComponentMask(GrPixelConfig config) {
     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(kFlags) == kGrPixelConfigCnt);
 }