Refactor CRC2D::reset() to avoid non-additive SkCanvas state operations

third_party/WebKit/Source/platform/graphics/gpu/AcceleratedImageBufferSurface.cpp

Index: third_party/WebKit/Source/platform/graphics/gpu/AcceleratedImageBufferSurface.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/gpu/AcceleratedImageBufferSurface.cpp b/third_party/WebKit/Source/platform/graphics/gpu/AcceleratedImageBufferSurface.cpp
index 0f25ff226a7c893f4c6cefb0d10885810f2c0f5e..f4e2ec0192b06e8e5f9984f42d40589b2cb3e687 100644
--- a/third_party/WebKit/Source/platform/graphics/gpu/AcceleratedImageBufferSurface.cpp
+++ b/third_party/WebKit/Source/platform/graphics/gpu/AcceleratedImageBufferSurface.cpp
@@ -58,9 +58,13 @@ AcceleratedImageBufferSurface::AcceleratedImageBufferSurface(
   m_surface = SkSurface::MakeRenderTarget(
       grContext, SkBudgeted::kYes, info, 0 /* sampleCount */,
       Opaque == opacityMode ? nullptr : &disableLCDProps);
-  if (!m_surface.get())
+  if (!m_surface)
     return;
   clear();
+
+  // Always save an initial frame, to support resetting the top level matrix
+  // and clip.
+  m_surface->getCanvas()->save();
 }
 
 bool AcceleratedImageBufferSurface::isValid() const {