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Added CanvasMemoryDumpProvider, made CanvasResourceProvider the provider's client, and implemented OnMemoryDump.
Since SkSurface has no interface to provide its memory usage, use SkImageInfo::computeBytesSize when allocating memory(not gpu) SkSurface.

Change-Id: I51cc40ab472403bb4a1e22fcae3fc6944a5f5a37
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2143178
Commit-Queue: Takashi Sakamoto <tasak@google.com>
Reviewed-by: Brian White <bcwhite@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: ssid <ssid@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771577}