Allow putting NV12 software GMBs into overlays on windows

ui/gl/gl_image_memory.cc

Index: ui/gl/gl_image_memory.cc
diff --git a/ui/gl/gl_image_memory.cc b/ui/gl/gl_image_memory.cc
index e0375239bf263cdd097bf966959b9f269bc2cdb4..20e694ff2fc322d622370749b3d97c5345492f67 100644
--- a/ui/gl/gl_image_memory.cc
+++ b/ui/gl/gl_image_memory.cc
@@ -363,6 +363,13 @@ GLImageMemory::GLImageMemory(const gfx::Size& size, unsigned internalformat)
 
 GLImageMemory::~GLImageMemory() {}
 
+// static
+GLImageMemory* GLImageMemory::FromGLImage(GLImage* image) {
+  if (!image || image->GetType() != Type::MEMORY)
+    return nullptr;
+  return static_cast<GLImageMemory*>(image);
+}
+
 bool GLImageMemory::Initialize(const unsigned char* memory,
                                gfx::BufferFormat format,
                                size_t stride) {
@@ -499,6 +506,10 @@ bool GLImageMemory::ScheduleOverlayPlane(gfx::AcceleratedWidget widget,
   return false;
 }
 
+GLImageMemory::Type GLImageMemory::GetType() const {
+  return Type::MEMORY;
+}
+
 // static
 unsigned GLImageMemory::GetInternalFormatForTesting(gfx::BufferFormat format) {
   DCHECK(ValidFormat(format));