Add half-float IOSurface GpuMemoryBuffer support

ui/gl/gl_image_io_surface.mm

Index: ui/gl/gl_image_io_surface.mm
diff --git a/ui/gl/gl_image_io_surface.mm b/ui/gl/gl_image_io_surface.mm
index 7b24aeaa67e119af7636709e6fc5ac92b09708fb..578fb92250c0cc789cd2ec37d80b9fd1f92b1ba5 100644
--- a/ui/gl/gl_image_io_surface.mm
+++ b/ui/gl/gl_image_io_surface.mm
@@ -50,6 +50,7 @@ bool ValidFormat(gfx::BufferFormat format) {
     case gfx::BufferFormat::BGRA_8888:
     case gfx::BufferFormat::BGRX_8888:
     case gfx::BufferFormat::RGBA_8888:
+    case gfx::BufferFormat::RGBA_F16:
     case gfx::BufferFormat::UYVY_422:
     case gfx::BufferFormat::YUV_420_BIPLANAR:
       return true;
@@ -79,6 +80,7 @@ GLenum TextureFormat(gfx::BufferFormat format) {
     case gfx::BufferFormat::BGRA_8888:
     case gfx::BufferFormat::BGRX_8888:
     case gfx::BufferFormat::RGBA_8888:
+    case gfx::BufferFormat::RGBA_F16:
       return GL_RGBA;
     case gfx::BufferFormat::UYVY_422:
       return GL_RGB;
@@ -111,6 +113,8 @@ GLenum DataFormat(gfx::BufferFormat format) {
     case gfx::BufferFormat::BGRX_8888:
     case gfx::BufferFormat::RGBA_8888:
       return GL_BGRA;
+    case gfx::BufferFormat::RGBA_F16:
+      return GL_RGBA;
     case gfx::BufferFormat::UYVY_422:
       return GL_YCBCR_422_APPLE;
     case gfx::BufferFormat::ATC:
@@ -140,6 +144,8 @@ GLenum DataType(gfx::BufferFormat format) {
     case gfx::BufferFormat::BGRX_8888:
     case gfx::BufferFormat::RGBA_8888:
       return GL_UNSIGNED_INT_8_8_8_8_REV;
+    case gfx::BufferFormat::RGBA_F16:
+      return GL_HALF_APPLE;
     case gfx::BufferFormat::UYVY_422:
       return GL_UNSIGNED_SHORT_8_8_APPLE;
       break;