viz: Fix wrong uv_rect calculation

CL:1045256 calculates |uv_rect| of the primary plane in wrong way. It causes
drmModeAtomicAddProperty failure. This CL fixes it.

BUG=896945

Change-Id: I6e914707cb961e8294e8ddd160b75e48ae5a2b64
Reviewed-on: https://chromium-review.googlesource.com/c/1291590
Commit-Queue: Dongseong Hwang <dongseong.hwang@intel.com>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Kristian H. Kristensen <hoegsberg@chromium.org>
Reviewed-by: Dongseong Hwang <dongseong.hwang@intel.com>
Cr-Commit-Position: refs/heads/master@{#601392}

components/viz/service/display/overlay_processor.cc

@@ -279,9 +279,11 @@ void OverlayProcessor::EliminateOrCropPrimary(
     // Sometimes the content quads extend past primary->display_rect, so first
     // clip the content_rect to that.
     content_rect.Intersect(primary->display_rect);
-    primary->uv_rect = gfx::ScaleRect(content_rect,
-                                      primary->display_rect.width(),
-                                      primary->display_rect.height());
+    DCHECK_NE(0, primary->display_rect.width());
+    DCHECK_NE(0, primary->display_rect.height());
+    primary->uv_rect =
+        gfx::ScaleRect(content_rect, 1. / primary->display_rect.width(),
+                       1. / primary->display_rect.height());
     primary->display_rect = content_rect;
 
     candidate_list->push_back(*primary);

components/viz/service/display/overlay_unittest.cc

@@ -1913,6 +1913,7 @@ TEST_F(UnderlayTest, PrimaryPlaneOverlayIsTransparentWithUnderlay) {
 
   OverlayCandidateList candidate_list;
   OverlayCandidate candidate;
+  candidate.display_rect = gfx::RectF(pass->output_rect);
   candidate.use_output_surface_for_resource = true;
   candidate.is_opaque = true;
   candidate_list.push_back(candidate);
@@ -2168,6 +2169,7 @@ TEST_F(UnderlayCastTest, PrimaryPlaneOverlayIsTransparentWithUnderlay) {
 
   OverlayCandidateList candidate_list;
   OverlayCandidate candidate;
+  candidate.display_rect = gfx::RectF(pass->output_rect);
   candidate.use_output_surface_for_resource = true;
   candidate.is_opaque = true;
   candidate_list.push_back(candidate);