Merge 92331 - [chromium] Fix issue where switching composited tabs evicts root textures

Source/WebCore/platform/graphics/chromium/LayerTilerChromium.cpp

Index: Source/WebCore/platform/graphics/chromium/LayerTilerChromium.cpp
===================================================================
--- Source/WebCore/platform/graphics/chromium/LayerTilerChromium.cpp	(revision 92334)
+++ Source/WebCore/platform/graphics/chromium/LayerTilerChromium.cpp	(working copy)
@@ -254,10 +254,10 @@
     for (int j = top; j <= bottom; ++j) {
         for (int i = left; i <= right; ++i) {
             Tile* tile = tileAt(i, j);
-            if (!tile || !tile->texture()->isValid(m_tileSize, GraphicsContext3D::RGBA))
+            if (!tile || !tile->texture()->isValid(m_tileSize, m_textureFormat))
                 continue;
 
-            tile->texture()->reserve(m_tileSize, GraphicsContext3D::RGBA);
+            tile->texture()->reserve(m_tileSize, m_textureFormat);
         }
     }
 }