Move NumberOfPlanesForGpuMemoryBufferFormat to gfx

ui/gfx/gpu_memory_buffer.cc

Index: ui/gfx/gpu_memory_buffer.cc
diff --git a/ui/gfx/gpu_memory_buffer.cc b/ui/gfx/gpu_memory_buffer.cc
index 44fcd31fd87513868f5d135d32393f7f92fc545d..adb8d98edb71eba492e269ce633616e1dd29d033 100644
--- a/ui/gfx/gpu_memory_buffer.cc
+++ b/ui/gfx/gpu_memory_buffer.cc
@@ -21,4 +21,25 @@ 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