Enable gpu rasterization in the vr shell

chrome/browser/android/vr_shell/textures/insecure_content_transient_texture.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/textures/insecure_content_transient_texture.h"
 
+#include "base/trace_event/trace_event.h"
 #include "cc/paint/skia_paint_canvas.h"
 #include "components/strings/grit/components_strings.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/font_list.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/vector2d.h"
 #include "ui/gfx/paint_vector_icon.h"
 #include "ui/gfx/vector_icon_types.h"
 #include "ui/vector_icons/vector_icons.h"
 
 namespace vr_shell {
 
 namespace {
 
 const SkColor kBackgroundColor = 0xCC1A1A1A;
 const SkColor kForegroundColor = SK_ColorWHITE;
 constexpr float kBorderFactor = 0.045;
 constexpr float kFontSizeFactor = 0.048;
 constexpr float kTextWidthFactor = 1.0 - 3 * kBorderFactor;
 
 }  // namespace
 
 InsecureContentTransientTexture::InsecureContentTransientTexture() = default;
 
 InsecureContentTransientTexture::~InsecureContentTransientTexture() = default;
 
 void InsecureContentTransientTexture::Draw(gfx::Canvas* canvas,
                                            const gfx::Size& texture_size) {
+  TRACE_EVENT0("gpu,vr", "InsecureContentTransientTexture::Draw");
   size_.set_width(texture_size.width());
   int max_height = texture_size.height();
   cc::PaintFlags flags;
   flags.setColor(kBackgroundColor);
 
+  TRACE_EVENT_BEGIN0("gpu,vr", "GetStringUTF16");
   int text_flags = gfx::Canvas::TEXT_ALIGN_CENTER | gfx::Canvas::MULTI_LINE;
   auto text =
       l10n_util::GetStringUTF16(IDS_PAGE_INFO_INSECURE_WEBVR_CONTENT_TRANSIENT);
+  TRACE_EVENT_END0("gpu,vr", "GetStringUTF16");
+
+  TRACE_EVENT_BEGIN0("gpu,vr", "GetFontList");
   auto fonts = GetFontList(size_.width() * kFontSizeFactor, text);
+  TRACE_EVENT_END0("gpu,vr", "GetFontList");
+
   int text_width = size_.width() * kTextWidthFactor;
   int text_height = 0;  // Will be increased during text measurement.
   gfx::Canvas::SizeStringInt(text, fonts, &text_width, &text_height, 0,
                              text_flags);
 
   // Making sure the drawing fits within the texture.
   text_height = std::min(
       text_height, static_cast<int>((1.0 - 2 * kBorderFactor) * size_.width()));
   size_.set_height(size_.width() * 2 * kBorderFactor + text_height);
   DCHECK_LE(size_.height(), max_height);
   canvas->DrawRoundRect(gfx::Rect(size_.width(), size_.height()),
                         size_.height() * kBorderFactor, flags);
 
   canvas->Save();
   canvas->Translate(gfx::Vector2d(size_.width() * kBorderFactor,
                                   size_.width() * kBorderFactor));
+
+  TRACE_EVENT_BEGIN0("gpu,vr", "DrawStringRectWithFlags");
   canvas->DrawStringRectWithFlags(
       text, fonts, kForegroundColor,
       gfx::Rect(kTextWidthFactor * size_.width(), text_height), text_flags);
+  TRACE_EVENT_END0("gpu,vr", "DrawStringRectWithFlags");
   canvas->Restore();
 }
 
 gfx::Size InsecureContentTransientTexture::GetPreferredTextureSize(
     int maximum_width) const {
   return gfx::Size(maximum_width, maximum_width);
 }
 
 gfx::SizeF InsecureContentTransientTexture::GetDrawnSize() const {
   return size_;
 }
 
 }  // namespace vr_shell