cc: Cache highp_threshold in TexCoordPrecisionRequired

cc/output/texture_copier.cc

Index: cc/output/texture_copier.cc
diff --git a/cc/output/texture_copier.cc b/cc/output/texture_copier.cc
index 3b1b708648b0345a5b7462014e64d3d58910e0af..585e8ba9310f7d237b8eff821b192f2ea284dc5a 100644
--- a/cc/output/texture_copier.cc
+++ b/cc/output/texture_copier.cc
@@ -18,7 +18,8 @@ AcceleratedTextureCopier::AcceleratedTextureCopier(
     int highp_threshold_min)
     : context_(context)
     , using_bind_uniforms_(using_bind_uniforms)
-    , highp_threshold_min_(highp_threshold_min) {
+    , highp_threshold_min_(highp_threshold_min)
+    , highp_threshold_cache_(0) {
   DCHECK(context_);
   GLC(context_, fbo_ = context_->createFramebuffer());
   GLC(context_, position_buffer_ = context_->createBuffer());
@@ -79,7 +80,7 @@ void AcceleratedTextureCopier::CopyTexture(Parameters parameters) {
           GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST));
 
   TexCoordPrecision texCoordPrecision = TexCoordPrecisionRequired(
-      context_, highp_threshold_min_, parameters.size);
+      context_, &highp_threshold_cache_, highp_threshold_min_, parameters.size);
   if (texCoordPrecision == TexCoordPrecisionHigh) {
     if (!blit_program_highp_->initialized())
       blit_program_highp_->Initialize(context_, using_bind_uniforms_);