Motivation: hide SkPDFDevice and SkPDFDocument behind PdfMetafileSkia class.
pdf_metafile_skia.cc:
Implement GetVectorCanvasForNewPage.
Remove StartPageForVectorCanvas.
Own the SkCanvas pointer (current_page_canvas_).
Replace page_outstanding_ field with a method that checks to see
if current_page_canvas_ is NULL.
Implement SaveTo.
skia::VectorPlatformDeviceSkia
remove class
print_web_view_helper.cc
Remove calls to canvas->getTopDevice()->setDrawingArea(...); (SkDFDevice)
This API is no longer effective.
print_web_view_helper_linux.cc,
print_web_view_helper_mac.mm,
print_web_view_helper_pdf_win.cc:
call GetVectorCanvasForNewPage rather than StartPageForVectorCanvas
BUG=278148
Review URL: https://codereview.chromium.org/704813002
Cr-Commit-Position: refs/heads/master@{#303522}
5be808e0b7