Fix build after https://codereview.chromium.org/1457033002
Fix build after https://codereview.chromium.org/1457033002

..\..\skia\ext\platform_device.cc(20,6) :  error: unused function 'SetBoolMetaData' [-Werror,-Wunused-function]
void SetBoolMetaData(const SkCanvas& canvas, const char* key,  bool value) {
     ^
..\..\skia\ext\platform_device.cc(25,6) :  error: unused function 'GetBoolMetaData' [-Werror,-Wunused-function]
bool GetBoolMetaData(const SkCanvas& canvas, const char* key) {
     ^

BUG=82385
TBR=tomhudson

Review URL: https://codereview.chromium.org/1464783003 .

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#360930}

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