Enable gpu rasterization in the vr shell

chrome/browser/android/vr_shell/ui_elements/textured_element.cc

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/android/vr_shell/ui_elements/textured_element.h"
 
-#include "cc/paint/skia_paint_canvas.h"
+#include "base/trace_event/trace_event.h"
 #include "chrome/browser/android/vr_shell/textures/ui_texture.h"
 #include "chrome/browser/android/vr_shell/vr_shell_renderer.h"
-#include "third_party/skia/include/core/SkSurface.h"
+#include "chrome/browser/android/vr_shell/vr_surface_provider.h"
+#include "skia/ext/texture_handle.h"
+#include "third_party/skia/include/core/SkCanvas.h"
 
 namespace vr_shell {
 
 TexturedElement::TexturedElement(int maximum_width)
     : texture_handle_(-1), maximum_width_(maximum_width) {}
 
 TexturedElement::~TexturedElement() = default;
 
 void TexturedElement::Initialize() {
-  glGenTextures(1, &texture_handle_);
-  DCHECK(GetTexture() != nullptr);
+  TRACE_EVENT0("gpu,vr", "TexturedElement::Initialize");
   texture_size_ = GetTexture()->GetPreferredTextureSize(maximum_width_);
-  sk_sp<SkSurface> surface = SkSurface::MakeRasterN32Premul(
+  DCHECK_NE(nullptr, surface_provider());
+  sk_sp<SkSurface> surface_ = surface_provider()->MakeSurface(
       texture_size_.width(), texture_size_.height());
-  GetTexture()->DrawAndLayout(surface->getCanvas(), texture_size_);
-  Flush(surface.get());
+  DCHECK_NE(nullptr, surface_.get());
+  SkCanvas* canvas = surface_->getCanvas();
+  {
+    TRACE_EVENT0("gpu,vr", "TexturedElement::Initialize DrawAndLayout");
+    GetTexture()->DrawAndLayout(canvas, texture_size_);
+  }
+  {
+    TRACE_EVENT0("gpu,vr", "TexturedElement::Initialize Flush");
+    canvas->flush();
+  }
   set_fill(Fill::SELF);
   gfx::SizeF drawn_size = GetTexture()->GetDrawnSize();
   float y = drawn_size.height() / drawn_size.width() * size().x();
   set_size({size().x(), y, 1});
+
+  {
+    TRACE_EVENT0("gpu,vr", "TexturedElement::Initialize getTextureHandle");
+    texture_handle_ = skia::GrBackendObjectToGrGLTextureInfo(
+                          surface_->getTextureHandle(
+                              SkSurface::kDiscardWrite_TextureHandleAccess))
+                          ->fID;
+  }
 }
 
 void TexturedElement::Render(VrShellRenderer* renderer,
                              vr::Mat4f view_proj_matrix) const {
   gfx::SizeF drawn_size = GetTexture()->GetDrawnSize();
   gfx::RectF copy_rect(0, 0, drawn_size.width() / texture_size_.width(),
                        drawn_size.height() / texture_size_.height());
   renderer->GetTexturedQuadRenderer()->AddQuad(
       texture_handle_, view_proj_matrix, copy_rect, opacity());
 }
 
-void TexturedElement::Flush(SkSurface* surface) {
-  cc::SkiaPaintCanvas paint_canvas(surface->getCanvas());
-  paint_canvas.flush();
-  SkPixmap pixmap;
-  CHECK(surface->peekPixels(&pixmap));
-
-  glBindTexture(GL_TEXTURE_2D, texture_handle_);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
-  glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, pixmap.width(), pixmap.height(), 0,
-               GL_RGBA, GL_UNSIGNED_BYTE, pixmap.addr());
-}
-
 }  // namespace vr_shell