[Android WebView] Migrate the rendering code to a separate set of classes.

android_webview/browser/browser_view_renderer.cc

+// Copyright (c) 2013 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 "android_webview/browser/browser_view_renderer.h"
+
+#include "android_webview/public/browser/draw_sw.h"
+#include "base/logging.h"
+#include "third_party/skia/include/core/SkGraphics.h"
+
+namespace {
+
+// Provides software rendering functions from the Android glue layer.
+// Allows preventing extra copies of data when rendering.
+AwDrawSWFunctionTable* g_sw_draw_functions = NULL;
+
+// Tells if the Skia library versions in Android and Chromium are compatible.
+// If they are then it's possible to pass Skia objects like SkPictures to the
+// Android glue layer via the SW rendering functions.
+// If they are not, then additional copies and rasterizations are required
+// as a fallback mechanism, which will have an important performance impact.
+bool g_is_skia_version_compatible = false;
+
+}
+
+namespace android_webview {
+
+BrowserViewRenderer::BrowserViewRenderer(Client* client,
+                                         JavaHelper* java_helper)
+    : client_(client),
+      java_helper_(java_helper) {
+}
+
+BrowserViewRenderer::~BrowserViewRenderer() {
+}
+
+// static
+void BrowserViewRenderer::SetAwDrawSWFunctionTable(
+    AwDrawSWFunctionTable* table) {
+  g_sw_draw_functions = table;
+  g_is_skia_version_compatible =
+      g_sw_draw_functions->is_skia_version_compatible(&SkGraphics::GetVersion);
+  LOG_IF(WARNING, !g_is_skia_version_compatible)
+      << "Skia versions are not compatible, rendering performance will suffer.";
+}
+
+// static
+AwDrawSWFunctionTable* BrowserViewRenderer::SWDrawFunctions() {
+  return g_sw_draw_functions;
+}
+
+// static
+bool BrowserViewRenderer::IsSkiaVersionCompatible() {
+  return g_is_skia_version_compatible;
+}
+
+}  // namespace android_webview