SkiaRenderer: Add const modifiers to support functions

Just a minor clean up to some of the internal drawing/prep functions
that don't actually modify SkiaRenderer itself.

CalculateRPDQParams cannot be const because it needs to create
ScopedSkImageBuilders, which don't work with const SkiaRenderer*'s.

Bug: 1013735
Change-Id: Ic3bddd6cea28dfaf4b977ebef77e1ced4eea6089
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1863629
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: weiliangc <weiliangc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712669}

components/viz/service/display/skia_renderer.cc

@@ -1253,7 +1253,7 @@ SkiaRenderer::DrawQuadParams SkiaRenderer::CalculateDrawQuadParams(
     const gfx::Transform& target_to_device,
     const gfx::Rect* scissor_rect,
     const DrawQuad* quad,
-    const gfx::QuadF* draw_region) {
+    const gfx::QuadF* draw_region) const {
   DrawQuadParams params(
       target_to_device * quad->shared_quad_state->quad_to_target_transform,
       gfx::RectF(quad->visible_rect), SkCanvas::kNone_QuadAAFlags,
@@ -1392,7 +1392,7 @@ const DrawQuad* SkiaRenderer::CanPassBeDrawnDirectly(const RenderPass* pass) {
 SkiaRenderer::BypassMode SkiaRenderer::CalculateBypassParams(
     const DrawQuad* bypass_quad,
     DrawRPDQParams* rpdq_params,
-    DrawQuadParams* params) {
+    DrawQuadParams* params) const {
   // Depending on bypass_quad's blend mode, its content may be irrelevant
   if (RenderPassRemainsTransparent(
           bypass_quad->shared_quad_state->blend_mode)) {
@@ -1469,9 +1469,10 @@ SkiaRenderer::BypassMode SkiaRenderer::CalculateBypassParams(
   return BypassMode::kDrawBypassQuad;
 }
 
-SkCanvas::ImageSetEntry SkiaRenderer::MakeEntry(const SkImage* image,
-                                                int matrix_index,
-                                                const DrawQuadParams& params) {
+SkCanvas::ImageSetEntry SkiaRenderer::MakeEntry(
+    const SkImage* image,
+    int matrix_index,
+    const DrawQuadParams& params) const {
   return SkCanvas::ImageSetEntry(
       {sk_ref_sp(image), gfx::RectFToSkRect(params.vis_tex_coords),
        gfx::RectFToSkRect(params.visible_rect), matrix_index, params.opacity,
@@ -1481,7 +1482,7 @@ SkCanvas::ImageSetEntry SkiaRenderer::MakeEntry(const SkImage* image,
 SkCanvas::SrcRectConstraint SkiaRenderer::ResolveTextureConstraints(
     const SkImage* image,
     const gfx::RectF& valid_texel_bounds,
-    DrawQuadParams* params) {
+    DrawQuadParams* params) const {
   if (params->aa_flags == SkCanvas::kNone_QuadAAFlags &&
       params->filter_quality == kNone_SkFilterQuality) {
     // Non-AA and no bilinear filtering so rendering won't filter outside the
@@ -1523,7 +1524,7 @@ SkCanvas::SrcRectConstraint SkiaRenderer::ResolveTextureConstraints(
 
 bool SkiaRenderer::MustFlushBatchedQuads(const DrawQuad* new_quad,
                                          const DrawRPDQParams* rpdq_params,
-                                         const DrawQuadParams& params) {
+                                         const DrawQuadParams& params) const {
   if (batched_quads_.empty())
     return false;
 

components/viz/service/display/skia_renderer.h

@@ -127,28 +127,28 @@ class VIZ_SERVICE_EXPORT SkiaRenderer : public DirectRenderer {
   DrawQuadParams CalculateDrawQuadParams(const gfx::Transform& target_to_device,
                                          const gfx::Rect* scissor_rect,
                                          const DrawQuad* quad,
-                                         const gfx::QuadF* draw_region);
+                                         const gfx::QuadF* draw_region) const;
   DrawRPDQParams CalculateRPDQParams(const RenderPassDrawQuad* quad,
                                      DrawQuadParams* params);
   // Modifies |params| and |rpdq_params| to apply correctly when drawing the
   // RenderPass directly via |bypass_quad|.
   BypassMode CalculateBypassParams(const DrawQuad* bypass_quad,
                                    DrawRPDQParams* rpdq_params,
-                                   DrawQuadParams* params);
+                                   DrawQuadParams* params) const;
 
   SkCanvas::ImageSetEntry MakeEntry(const SkImage* image,
                                     int matrix_index,
-                                    const DrawQuadParams& params);
+                                    const DrawQuadParams& params) const;
   // Returns overall constraint to pass to Skia, and modifies |params| to
   // emulate content area clamping different from the provided texture coords.
   SkCanvas::SrcRectConstraint ResolveTextureConstraints(
       const SkImage* image,
       const gfx::RectF& valid_texel_bounds,
-      DrawQuadParams* params);
+      DrawQuadParams* params) const;
 
   bool MustFlushBatchedQuads(const DrawQuad* new_quad,
                              const DrawRPDQParams* rpdq_params,
-                             const DrawQuadParams& params);
+                             const DrawQuadParams& params) const;
   void AddQuadToBatch(const SkImage* image,
                       const gfx::RectF& valid_texel_bounds,
                       DrawQuadParams* params);