Prefetch browser content with tiled page

bug:5262519

Use the tiled page not used by content rendering to render much fewer tiles
for the same content, at an inflated scale.

These prefetched tiles are prioritized for painting above all others, so that
content is (almost) always visible on the base layer.

Change-Id: I598b7925cb68beef632f828df3ae522a0b21e2b4

1 files changed, 3 insertions, 0 deletions

diff --git a/Source/WebCore/platform/graphics/android/TiledPage.h b/Source/WebCore/platform/graphics/android/TiledPage.h
index 946421c..c903abc 100644
--- a/Source/WebCore/platform/graphics/android/TiledPage.h
+++ b/Source/WebCore/platform/graphics/android/TiledPage.h
@@ -98,6 +98,8 @@ public:
     void updateBaseTileSize();
     bool scrollingDown() { return m_scrollingDown; }
     SkIRect* expandedTileBounds() { return &m_expandedTileBounds; }
+    bool isPrefetchPage() { return m_isPrefetchPage; }
+    void setIsPrefetchPage(bool isPrefetch) { m_isPrefetchPage = isPrefetch; }
 
 private:
     void prepareRow(bool goingLeft, int tilesInRow, int firstTileX, int y, const SkIRect& tileBounds);
@@ -127,6 +129,7 @@ private:
     bool m_prepare;
     bool m_scrollingDown;
     SkIRect m_expandedTileBounds;
+    bool m_isPrefetchPage;
 };
 
 } // namespace WebCore