cc: ImageDecodes: Increase the cache item count limit to 1000.

We've switched from using a vector to using a hash map for the cached
items. This allows us to raise the limit of the number of (unlocked)
items we cache. Set this to 1000 (arbitrarily).

R=ericrk, enne
BUG=577421
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1839783004

Cr-Commit-Position: refs/heads/master@{#383842}

cc/tiles/software_image_decode_controller.cc

@@ -30,7 +30,7 @@ const size_t kMaxHighQualityImageSizeBytes = 64 * 1024 * 1024;
 
 // The number of entries to keep around in the cache. This limit can be breached
 // if more items are locked. That is, locked items ignore this limit.
-const size_t kMaxItemsInCache = 100;
+const size_t kMaxItemsInCache = 1000;
 
 class AutoRemoveKeyFromTaskMap {
  public: