Move NumberOfPlanesForGpuMemoryBufferFormat to gfx

ui/gfx/gpu_memory_buffer.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 "ui/gfx/gpu_memory_buffer.h"
 
 #include "base/format_macros.h"
 #include "base/strings/stringprintf.h"
 
 namespace gfx {
 
 base::trace_event::MemoryAllocatorDumpGuid GetGpuMemoryBufferGUIDForTracing(
     uint64 tracing_process_id,
     GpuMemoryBufferId buffer_id) {
   return base::trace_event::MemoryAllocatorDumpGuid(
       base::StringPrintf("gpumemorybuffer-x-process/%" PRIx64 "/%d",
                          tracing_process_id, buffer_id));
 }
 
 GpuMemoryBufferHandle::GpuMemoryBufferHandle()
     : type(EMPTY_BUFFER), id(0), handle(base::SharedMemory::NULLHandle()) {
 }
 
+// static
+size_t GpuMemoryBuffer::NumberOfPlanes(BufferFormat format) {
+  switch (format) {
+    case BufferFormat::ATC:
+    case BufferFormat::ATCIA:
+    case BufferFormat::DXT1:
+    case BufferFormat::DXT5:
+    case BufferFormat::ETC1:
+    case BufferFormat::R_8:
+    case BufferFormat::RGBA_4444:
+    case BufferFormat::RGBA_8888:
+    case BufferFormat::RGBX_8888:
+    case BufferFormat::BGRA_8888:
+      return 1;
+    case BufferFormat::YUV_420:
+      return 3;
+  }
+  NOTREACHED();
+  return 0;
+}
+
 }  // namespace gfx