cc: Cache highp_threshold in TexCoordPrecisionRequired

cc/output/gl_renderer.cc

Index: cc/output/gl_renderer.cc
diff --git a/cc/output/gl_renderer.cc b/cc/output/gl_renderer.cc
index adfcf473665d0b7e0e317910b8d247a6258906f5..cac9d9ca70b8fde77bf2990a4c801bd6b0ea21c5 100644
--- a/cc/output/gl_renderer.cc
+++ b/cc/output/gl_renderer.cc
@@ -115,6 +115,7 @@ GLRenderer::GLRenderer(RendererClient* client,
       visible_(true),
       is_scissor_enabled_(false),
       highp_threshold_min_(highp_threshold_min),
+      highp_threshold_cache_(0),
       on_demand_tile_raster_resource_id_(0) {
   DCHECK(context_);
 }
@@ -751,7 +752,7 @@ void GLRenderer::DrawRenderPassQuad(DrawingFrame* frame,
   }
 
   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
-      context_, highp_threshold_min_,
+      context_, &highp_threshold_cache_, highp_threshold_min_,
       quad->shared_quad_state->visible_content_rect.bottom_right());
 
   int shader_quad_location = -1;
@@ -1226,7 +1227,8 @@ void GLRenderer::DrawContentQuad(const DrawingFrame* frame,
   float vertex_tex_scale_y = tile_rect.height() / clamp_geom_rect.height();
 
   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
-      context_, highp_threshold_min_, quad->texture_size);
+      context_, &highp_threshold_cache_, highp_threshold_min_,
+      quad->texture_size);
 
   // Map to normalized texture coordinates.
   gfx::Size texture_size = quad->texture_size;
@@ -1344,7 +1346,7 @@ void GLRenderer::DrawYUVVideoQuad(const DrawingFrame* frame,
   SetBlendEnabled(quad->ShouldDrawWithBlending());
 
   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
-      context_, highp_threshold_min_,
+      context_, &highp_threshold_cache_, highp_threshold_min_,
       quad->shared_quad_state->visible_content_rect.bottom_right());
 
   const VideoYUVProgram* program = GetVideoYUVProgram(tex_coord_precision);
@@ -1416,7 +1418,7 @@ void GLRenderer::DrawStreamVideoQuad(const DrawingFrame* frame,
   DCHECK(capabilities_.using_egl_image);
 
   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
-      context_, highp_threshold_min_,
+      context_, &highp_threshold_cache_, highp_threshold_min_,
       quad->shared_quad_state->visible_content_rect.bottom_right());
 
   const VideoStreamTextureProgram* program =
@@ -1590,7 +1592,7 @@ void GLRenderer::FlushTextureQuadCache() {
 void GLRenderer::EnqueueTextureQuad(const DrawingFrame* frame,
                                     const TextureDrawQuad* quad) {
   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
-      context_, highp_threshold_min_,
+      context_, &highp_threshold_cache_, highp_threshold_min_,
       quad->shared_quad_state->visible_content_rect.bottom_right());
 
   // Choose the correct texture program binding
@@ -1645,7 +1647,7 @@ void GLRenderer::EnqueueTextureQuad(const DrawingFrame* frame,
 void GLRenderer::DrawTextureQuad(const DrawingFrame* frame,
                                  const TextureDrawQuad* quad) {
   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
-      context_, highp_threshold_min_,
+      context_, &highp_threshold_cache_, highp_threshold_min_,
       quad->shared_quad_state->visible_content_rect.bottom_right());
 
   TexTransformTextureProgramBinding binding;
@@ -1699,7 +1701,7 @@ void GLRenderer::DrawIOSurfaceQuad(const DrawingFrame* frame,
   SetBlendEnabled(quad->ShouldDrawWithBlending());
 
   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
-      context_, highp_threshold_min_,
+      context_,  &highp_threshold_cache_, highp_threshold_min_,
       quad->shared_quad_state->visible_content_rect.bottom_right());
 
   TexTransformTextureProgramBinding binding;
@@ -1852,7 +1854,8 @@ void GLRenderer::CopyTextureToFramebuffer(const DrawingFrame* frame,
                                           gfx::Rect rect,
                                           const gfx::Transform& draw_matrix) {
   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
-      context_, highp_threshold_min_, rect.bottom_right());
+      context_, &highp_threshold_cache_, highp_threshold_min_,
+      rect.bottom_right());
   const RenderPassProgram* program = GetRenderPassProgram(tex_coord_precision);
 
   GLC(Context(), Context()->bindTexture(GL_TEXTURE_2D, texture_id));