ozone: Add overlay candidate implementation that queries support via IPC

ui/ozone/common/gpu/ozone_gpu_message_params.cc

Index: ui/ozone/common/gpu/ozone_gpu_message_params.cc
diff --git a/ui/ozone/common/gpu/ozone_gpu_message_params.cc b/ui/ozone/common/gpu/ozone_gpu_message_params.cc
index de90c80e8d95b7fec8564ee6ab7e2f0492e5d7df..100f208af00bc92bb1e64b06239572cc05cab33a 100644
--- a/ui/ozone/common/gpu/ozone_gpu_message_params.cc
+++ b/ui/ozone/common/gpu/ozone_gpu_message_params.cc
@@ -4,6 +4,9 @@
 
 #include "ui/ozone/common/gpu/ozone_gpu_message_params.h"
 
+#include "ui/gfx/geometry/rect_conversions.h"
+#include "ui/gfx/ipc/gfx_param_traits.h"
+
 namespace ui {
 
 DisplayMode_Params::DisplayMode_Params()
@@ -29,4 +32,22 @@ DisplaySnapshot_Params::DisplaySnapshot_Params()
 
 DisplaySnapshot_Params::~DisplaySnapshot_Params() {}
 
+OverlayCheck_Params::OverlayCheck_Params()
+    : transform(gfx::OVERLAY_TRANSFORM_INVALID),
+      format(SurfaceFactoryOzone::UNKNOWN),
+      plane_z_order(0) {
+}
+
+OverlayCheck_Params::OverlayCheck_Params(
+    const OverlayCandidatesOzone::OverlaySurfaceCandidate& candidate)
+    : buffer_size(candidate.buffer_size),
+      transform(candidate.transform),
+      format(candidate.format),
+      display_rect(gfx::ToNearestRect(candidate.display_rect)),

[spang, 2015/06/01 18:54:20]

why is it a RectF in OverlayCandidatesOzone and a Rect in OverlayCheck_Params?

[achaulk, 2015/06/01 20:43:08]

We convert to ints internally, this is post-conversion

+      plane_z_order(candidate.plane_z_order) {
+}
+
+OverlayCheck_Params::~OverlayCheck_Params() {
+}
+
 }  // namespace ui