[cc] Add nearest neighbor filtering for TextureLayer.

cc/blink/web_external_texture_layer_impl.cc

Index: cc/blink/web_external_texture_layer_impl.cc
diff --git a/cc/blink/web_external_texture_layer_impl.cc b/cc/blink/web_external_texture_layer_impl.cc
index 85aac10fe0d079a16c7ac103acfabb8f3a181839..9d0abd01dce49d3d314d13a99d556ecadde21033 100644
--- a/cc/blink/web_external_texture_layer_impl.cc
+++ b/cc/blink/web_external_texture_layer_impl.cc
@@ -24,7 +24,9 @@ namespace cc_blink {
 
 WebExternalTextureLayerImpl::WebExternalTextureLayerImpl(
     blink::WebExternalTextureLayerClient* client)
-    : client_(client) {
+    : client_(client),
+      nearest_neighbor_(false) {
+  //printf("WebExternalTextureLayerImpl %c\n", (client_ ? '1' : '0'));
   cc::TextureLayerClient* cc_client = client_ ? this : nullptr;
   scoped_refptr<TextureLayer> layer = TextureLayer::CreateForMailbox(cc_client);
   layer->SetIsDrawable(true);
@@ -62,6 +64,14 @@ void WebExternalTextureLayerImpl::setRateLimitContext(bool rate_limit) {
   static_cast<TextureLayer*>(layer_->layer())->SetRateLimitContext(rate_limit);
 }
 
+void WebExternalTextureLayerImpl::setFilterLevel(
+    SkPaint::FilterLevel filter_level) {
+  //printf("WebExternalTextureLayerImpl::setFilterLevel %d\n", filter_level == SkPaint::kNone_FilterLevel);
+  nearest_neighbor_ = filter_level == SkPaint::kNone_FilterLevel;
+  static_cast<TextureLayer*>(layer_->layer())
+      ->SetNearestNeighbor(nearest_neighbor_);
+}
+
 bool WebExternalTextureLayerImpl::PrepareTextureMailbox(
     cc::TextureMailbox* mailbox,
     scoped_ptr<cc::SingleReleaseCallback>* release_callback,
@@ -85,6 +95,7 @@ bool WebExternalTextureLayerImpl::PrepareTextureMailbox(
         cc::TextureMailbox(name, GL_TEXTURE_2D, client_mailbox.syncPoint);
   }
   mailbox->set_allow_overlay(client_mailbox.allowOverlay);
+  mailbox->set_nearest_neighbor(nearest_neighbor_);

[piman, 2014/10/28 05:09:50]

This should not be set indiscriminately, but based on what the client set on the
texture - i.e. this should be also added to WebExternalTextureMailbox and set by
blink.

[jackhou1, 2014/10/29 00:12:24]

Done.

 
   if (mailbox->IsValid()) {
     *release_callback = cc::SingleReleaseCallback::Create(