Revert of Add compositor support for half-float RGBA buffers and textures

cc/raster/raster_buffer_provider.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/raster/raster_buffer_provider.h"
 
 #include <stddef.h>
 
 #include "base/trace_event/trace_event.h"
 #include "cc/playback/raster_source.h"
 #include "cc/raster/texture_compressor.h"
 #include "cc/resources/platform_color.h"
 #include "cc/resources/resource_format_utils.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkSurface.h"
 
 namespace cc {
 
 RasterBufferProvider::RasterBufferProvider() {}
 
 RasterBufferProvider::~RasterBufferProvider() {}
 
 namespace {
 
 bool IsSupportedPlaybackToMemoryFormat(ResourceFormat format) {
   switch (format) {
     case RGBA_4444:
     case RGBA_8888:
     case BGRA_8888:
-    case RGBA_F16:
     case ETC1:
       return true;
     case ALPHA_8:
     case LUMINANCE_8:
     case RGB_565:
     case RED_8:
     case LUMINANCE_F16:
       return false;
   }
   NOTREACHED();
@@ skipping 29 matching lines @@
     // LegacyFontHost will get LCD text and skia figures out what type to use.
     surface_props = SkSurfaceProps(SkSurfaceProps::kLegacyFontHost_InitType);
   }
 
   if (!stride)
     stride = info.minRowBytes();
   DCHECK_GT(stride, 0u);
 
   switch (format) {
     case RGBA_8888:
-    case BGRA_8888:
-    case RGBA_F16: {
+    case BGRA_8888: {
       sk_sp<SkSurface> surface =
           SkSurface::MakeRasterDirect(info, memory, stride, &surface_props);
       raster_source->PlaybackToCanvas(surface->getCanvas(), canvas_bitmap_rect,
                                       canvas_playback_rect, scale,
                                       playback_settings);
       return;
     }
     case RGBA_4444:
     case ETC1: {
       sk_sp<SkSurface> surface = SkSurface::MakeRaster(info, &surface_props);
@@ skipping 46 matching lines @@
       // Initialize resource using the preferred PlatformColor component
       // order and swizzle in the shader instead of in software.
       return !PlatformColor::SameComponentOrder(format);
     case RGBA_4444:
     case ETC1:
     case ALPHA_8:
     case LUMINANCE_8:
     case RGB_565:
     case RED_8:
     case LUMINANCE_F16:
-    case RGBA_F16:
       return false;
   }
   NOTREACHED();
   return false;
 }
 
 }  // namespace cc