Reland "Make GPU cache invalidation SkMessageBus messages go to one GrContext."

This is a reland of f4c5bb9aba485aa47c27b15905d81992b7cf4707

Original change's description:
> Make GPU cache invalidation SkMessageBus messages go to one GrContext.
> 
> Makes it so the template param to SkMessageBus must implement:
> bool shouldSend(uint32_t inboxID) const
> 
> Updates all GPU backend message types to only go to the GrContext that
> is adding a cache entry.
> 
> Bug: skia:
> Change-Id: I3e8a4eb90654b7b8ac57cac9fb508c0ef1d51058
> Reviewed-on: https://skia-review.googlesource.com/140220
> Reviewed-by: Robert Phillips <robertphillips@google.com>
> Reviewed-by: Jim Van Verth <jvanverth@google.com>

Bug: skia:
Change-Id: I8402bfe3ed0170c99936d47050458817030b473b
Reviewed-on: https://skia-review.googlesource.com/140801
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/gpu/GrOnFlushResourceProvider.cpp b/src/gpu/GrOnFlushResourceProvider.cpp
index ddf66020d2..26b59f93b9 100644
--- a/src/gpu/GrOnFlushResourceProvider.cpp
+++ b/src/gpu/GrOnFlushResourceProvider.cpp
@@ -6,6 +6,7 @@
  */
 
 #include "GrOnFlushResourceProvider.h"
+#include "GrContext.h"
 #include "GrContextPriv.h"
 #include "GrDrawingManager.h"
 #include "GrProxyProvider.h"
@@ -130,6 +131,10 @@ sk_sp<const GrBuffer> GrOnFlushResourceProvider::findOrMakeStaticBuffer(GrBuffer
     return buffer;
 }
 
+uint32_t GrOnFlushResourceProvider::contextUniqueID() const {
+    return fDrawingMgr->getContext()->uniqueID();
+}
+
 const GrCaps* GrOnFlushResourceProvider::caps() const {
     return fDrawingMgr->getContext()->contextPriv().caps();
 }