[cc] Dont throw away tiles that stop moving

cc/tile_manager.cc

Index: cc/tile_manager.cc
diff --git a/cc/tile_manager.cc b/cc/tile_manager.cc
index 16d82d46a8a885052d1549bf4749c73e9d1e50f9..7a77a62c301b4c29b3e7c7da2dfd9a95908a5025 100644
--- a/cc/tile_manager.cc
+++ b/cc/tile_manager.cc
@@ -49,9 +49,6 @@ inline TileManagerBin BinFromTilePriority(const TilePriority& prio) {
       TilePriority::kMaxDistanceInContentSpace)
     return NEVER_BIN;
 
-  if (prio.time_to_visible_in_seconds == std::numeric_limits<float>::max())
-    return NEVER_BIN;
-
   if (prio.time_to_visible_in_seconds == 0 ||
       prio.distance_to_visible_in_pixels < backfling_guard_distance_pixels)
     return NOW_BIN;
@@ -517,8 +514,16 @@ void TileManager::AssignGpuMemoryToTiles() {
     }
     bytes_left -= tile_bytes;
     managed_tile_state.can_use_gpu_memory = true;
-    if (!managed_tile_state.resource &&
-        !managed_tile_state.resource_is_being_initialized) {
+    if (managed_tile_state.resource ||

[ccameron, 2013/02/12 05:05:36]

Remove this part of the diff.

+        managed_tile_state.resource_is_being_initialized)
+      continue;
+
+    // Only rasterize NOW, and SOON tiles. EVENTUALLY-binned tiles are kept
+    // around if we had their texture, but a never pro-actively painted.
+    bool is_in_eventually_bins =
+      managed_tile_state.bin[HIGH_PRIORITY_BIN] == EVENTUALLY_BIN &&
+      managed_tile_state.bin[LOW_PRIORITY_BIN] == EVENTUALLY_BIN;
+    if (!is_in_eventually_bins) {
       tiles_that_need_to_be_rasterized_.push_back(tile);
       DidTileRasterStateChange(tile, WAITING_FOR_RASTER_STATE);
     }