Revert "Revert "Add 1010102 support to Ganesh""

This reverts commit ded47a50143470d1acdafa03e878cc7da5608038.

Bug: skia:
Change-Id: I7d7552e6ccc8591cae91426407ab13b628b93b68
Reviewed-on: https://skia-review.googlesource.com/111760
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
diff --git a/src/gpu/gl/GrGLUtil.cpp b/src/gpu/gl/GrGLUtil.cpp
index 791d9ec..6b44402 100644
--- a/src/gpu/gl/GrGLUtil.cpp
+++ b/src/gpu/gl/GrGLUtil.cpp
@@ -504,6 +504,8 @@
             return kRGB_565_GrPixelConfig;
         case GR_GL_RGBA4:
             return kRGBA_4444_GrPixelConfig;
+        case GR_GL_RGB10_A2:
+            return kRGBA_1010102_GrPixelConfig;
         case GR_GL_LUMINANCE8:
             return kGray_8_GrPixelConfig;
         case GR_GL_RGBA32F: