Fix mash chrome crashing when hovering over link.

components/mus/ws/platform_display.cc

Index: components/mus/ws/platform_display.cc
diff --git a/components/mus/ws/platform_display.cc b/components/mus/ws/platform_display.cc
index 55de1b771771917a094d806c94bc8c95d54e09e4..ac3a2962de5398b1a5b073beda9a58a0d1032290 100644
--- a/components/mus/ws/platform_display.cc
+++ b/components/mus/ws/platform_display.cc
@@ -114,11 +114,12 @@ void DrawWindowTree(cc::RenderPass* pass,
     const gfx::Rect bounds_at_origin(window->bounds().size());
     // TODO(fsamuel): These clipping and visible rects are incorrect. They need
     // to be populated from CompositorFrame structs.
-    sqs->SetAll(
-        quad_to_target_transform, bounds_at_origin.size() /* layer_bounds */,
-        bounds_at_origin /* visible_layer_bounds */,
-        bounds_at_origin /* clip_rect */, false /* is_clipped */,
-        window->opacity(), SkXfermode::kSrc_Mode, 0 /* sorting-context_id */);

[sky, 2016/04/25 16:00:15]

AHA! This must be the random CHECK I randomly see:

#0 0x7f320e07e66e base::debug::StackTrace::StackTrace()
#1 0x7f320e0def5f logging::LogMessage::~LogMessage()
#2 0x7f320226efef cc::(anonymous namespace)::BlendModeFromSkXfermode()
#3 0x7f3202267c75 cc::GLRenderer::DrawRenderPassQuad()
#4 0x7f32022654f5 cc::GLRenderer::DoDrawQuad()
#5 0x7f3202251935 cc::DirectRenderer::DrawRenderPass()
#6 0x7f32022506e3 cc::DirectRenderer::DrawRenderPassAndExecuteCopyRequests()
#7 0x7f320225058e cc::DirectRenderer::DrawFrame()
#8 0x7f32010b5579 cc::Display::DrawAndSwap()
#9 0x7f32010c9d72 cc::DisplayScheduler::DrawAndSwap()
#10 0x7f32010c94a2 cc::DisplayScheduler::AttemptDrawAndSwap()
#11 0x7f32010c8eec cc::DisplayScheduler::OnBeginFrameDeadline()
#12 0x7f32010cdeb9
_ZN4base8internal15RunnableAdapterIMN2cc16DisplaySchedulerEFvvEE3RunIJEEEvPS3_DpOT_
#13 0x7f32010cddc0
_ZN4base8internal12InvokeHelperILb1EvNS0_15RunnableAdapterIMN2cc16DisplaySchedulerEFvvEEEE8MakeItSoINS_7WeakPtrIS4_EEJEEEvS7_T_DpOT0_
#14 0x7f32010cdd6d
_ZN4base8internal7InvokerINS_13IndexSequenceIJLm0EEEENS0_9BindStateINS0_15RunnableAdapterIMN2cc16DisplaySchedulerEFvvEEEFvPS7_EJNS_7WeakPtrIS7_E\

Nice!

+    sqs->SetAll(quad_to_target_transform,
+                bounds_at_origin.size() /* layer_bounds */,
+                bounds_at_origin /* visible_layer_bounds */,
+                bounds_at_origin /* clip_rect */, false /* is_clipped */,
+                window->opacity(), SkXfermode::kSrcOver_Mode,
+                0 /* sorting-context_id */);
     auto quad = pass->CreateAndAppendDrawQuad<cc::SurfaceDrawQuad>();
     quad->SetAll(sqs, bounds_at_origin /* rect */,
                  gfx::Rect() /* opaque_rect */,