Revert "Add a new GrResourceCache purging mechanism for purging unused resources."

This reverts commit fbb56ce83fc717b7c6722324bbccd1ae73c350a4.

Reason for revert: Chrome's ancient libstdc++ doesn't like use of steady_clock

Original change's description:
> Add a new GrResourceCache purging mechanism for purging unused resources.
> 
> The client may call GrContext::purgeResourceNotUsedSince() with a stead_clock::time_point and all resources that have been purgeable since before that time point are purged.
> 
> This is intended to replace the "max unused flushes" purging mechanism once Chrome adopts it.
> 
> Change-Id: I28881dd2959cc01c0acca81b2d6001ee5626439d
> Reviewed-on: https://skia-review.googlesource.com/8920
> Commit-Queue: Brian Salomon <bsalomon@google.com>
> Reviewed-by: Robert Phillips <robertphillips@google.com>
> Reviewed-by: Eric Karl <ericrk@google.com>
> 

TBR=bsalomon@google.com,robertphillips@google.com,ericrk@google.com,reviews@skia.org,ericrk@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Change-Id: I3baa3b2e80302315b757d4d625732459e13795d4
Reviewed-on: https://skia-review.googlesource.com/10004
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>

1 files changed, 0 insertions, 19 deletions

diff --git a/src/gpu/GrResourceCache.cpp b/src/gpu/GrResourceCache.cpp
index 97d3b96808..9462a7384d 100644
--- a/src/gpu/GrResourceCache.cpp
+++ b/src/gpu/GrResourceCache.cpp
@@ -365,7 +365,6 @@ void GrResourceCache::notifyCntReachedZero(GrGpuResource* resource, uint32_t fla
     this->removeFromNonpurgeableArray(resource);
     fPurgeableQueue.insert(resource);
     resource->cacheAccess().setFlushCntWhenResourceBecamePurgeable(fExternalFlushCnt);
-    resource->cacheAccess().setTimeWhenResourceBecomePurgeable();
 
     if (SkBudgeted::kNo == resource->resourcePriv().isBudgeted()) {
         // Check whether this resource could still be used as a scratch resource.
@@ -505,24 +504,6 @@ void GrResourceCache::purgeAllUnlocked() {
     this->validate();
 }
 
-void GrResourceCache::purgeResourcesNotUsedSince(std::chrono::steady_clock::time_point purgeTime) {
-    while (fPurgeableQueue.count()) {
-        const std::chrono::steady_clock::time_point resourceTime =
-                fPurgeableQueue.peek()->cacheAccess().timeWhenResourceBecamePurgeable();
-        if (resourceTime >= purgeTime) {
-            // Resources were given both LRU timestamps and tagged with a frame number when
-            // they first became purgeable. The LRU timestamp won't change again until the
-            // resource is made non-purgeable again. So, at this point all the remaining
-            // resources in the timestamp-sorted queue will have a frame number >= to this
-            // one.
-            break;
-        }
-        GrGpuResource* resource = fPurgeableQueue.peek();
-        SkASSERT(resource->isPurgeable());
-        resource->cacheAccess().release();
-    }
-}
-
 void GrResourceCache::processInvalidUniqueKeys(
     const SkTArray<GrUniqueKeyInvalidatedMessage>& msgs) {
     for (int i = 0; i < msgs.count(); ++i) {