Add half-float IOSurface GpuMemoryBuffer support

ui/gfx/buffer_format_util.cc

Index: ui/gfx/buffer_format_util.cc
diff --git a/ui/gfx/buffer_format_util.cc b/ui/gfx/buffer_format_util.cc
index 4432b3e9a6c88568fe60ea4165f99b42816cd981..35003e1072d35d61bad2264967eb9cf4f1b17e1f 100644
--- a/ui/gfx/buffer_format_util.cc
+++ b/ui/gfx/buffer_format_util.cc
@@ -11,22 +11,16 @@
 namespace gfx {
 namespace {
 
-const BufferFormat kBufferFormats[] = {BufferFormat::ATC,
-                                       BufferFormat::ATCIA,
-                                       BufferFormat::DXT1,
-                                       BufferFormat::DXT5,
-                                       BufferFormat::ETC1,
-                                       BufferFormat::R_8,
-                                       BufferFormat::RG_88,
-                                       BufferFormat::BGR_565,
-                                       BufferFormat::RGBA_4444,
-                                       BufferFormat::RGBX_8888,
-                                       BufferFormat::RGBA_8888,
-                                       BufferFormat::BGRX_8888,
-                                       BufferFormat::BGRA_8888,
-                                       BufferFormat::UYVY_422,
-                                       BufferFormat::YUV_420_BIPLANAR,
-                                       BufferFormat::YVU_420};
+const BufferFormat kBufferFormats[] = {
+    BufferFormat::ATC,       BufferFormat::ATCIA,
+    BufferFormat::DXT1,      BufferFormat::DXT5,
+    BufferFormat::ETC1,      BufferFormat::R_8,
+    BufferFormat::RG_88,     BufferFormat::BGR_565,
+    BufferFormat::RGBA_4444, BufferFormat::RGBX_8888,
+    BufferFormat::RGBA_8888, BufferFormat::BGRX_8888,
+    BufferFormat::BGRA_8888, BufferFormat::RGBA_F16,
+    BufferFormat::UYVY_422,  BufferFormat::YUV_420_BIPLANAR,
+    BufferFormat::YVU_420};
 
 static_assert(arraysize(kBufferFormats) ==
                   (static_cast<int>(BufferFormat::LAST) + 1),
@@ -74,6 +68,12 @@ bool RowSizeForBufferFormatChecked(
         return false;
       *size_in_bytes = checked_size.ValueOrDie();
       return true;
+    case BufferFormat::RGBA_F16:
+      checked_size *= 8;
+      if (!checked_size.IsValid())
+        return false;
+      *size_in_bytes = checked_size.ValueOrDie();
+      return true;
     case BufferFormat::YVU_420:
       DCHECK_EQ(0u, width % 2);
       *size_in_bytes = width / SubsamplingFactorForBufferFormat(format, plane);
@@ -109,6 +109,7 @@ size_t NumberOfPlanesForBufferFormat(BufferFormat format) {
     case BufferFormat::RGBA_8888:
     case BufferFormat::BGRX_8888:
     case BufferFormat::BGRA_8888:
+    case BufferFormat::RGBA_F16:
     case BufferFormat::UYVY_422:
       return 1;
     case BufferFormat::YUV_420_BIPLANAR:
@@ -135,6 +136,7 @@ size_t SubsamplingFactorForBufferFormat(BufferFormat format, size_t plane) {
     case BufferFormat::RGBA_8888:
     case BufferFormat::BGRX_8888:
     case BufferFormat::BGRA_8888:
+    case BufferFormat::RGBA_F16:
     case BufferFormat::UYVY_422:
       return 1;
     case BufferFormat::YVU_420: {
@@ -206,6 +208,7 @@ size_t BufferOffsetForBufferFormat(const Size& size,
     case BufferFormat::RGBA_8888:
     case BufferFormat::BGRX_8888:
     case BufferFormat::BGRA_8888:
+    case BufferFormat::RGBA_F16:
     case BufferFormat::UYVY_422:
       return 0;
     case BufferFormat::YVU_420: {