Merge 101903 - REGRESSION (r91125): Polyline tool in google docs is broken

Merge 101903 - REGRESSION (r91125): Polyline tool in google docs is broken
https://bugs.webkit.org/show_bug.cgi?id=65796

Source/WebCore:

Patch by Stephen Chenney <schenney@chromium.org>; on 2011-12-02
Reviewed by Darin Adler.

Work around a bug in CoreGraphics, that caused incorrect bounds for paths
consisting only of move-to elements. This causes problems in SVG, when the enormous
bounds prevented the drawing of things behind.

Tests: svg/custom/path-moveto-only-rendering.svg
       svg/custom/subpaths-moveto-only-rendering.svg

* platform/graphics/cg/PathCG.cpp:
(WebCore::PathIsEmptyOrSingleMoveTester::PathIsEmptyOrSingleMoveTester): Class to
test for isEmpty accoridng ot the same rules as other platforms.
(WebCore::PathIsEmptyOrSingleMoveTester::isEmpty): Query the result
(WebCore::PathIsEmptyOrSingleMoveTester::testPathElement): Path iterator method
(WebCore::PathHasOnlyMoveToTester::PathHasOnlyMoveToTester): Class to test whether a
path contains only move-to elements, and hence should have null bounds.
(WebCore::PathHasOnlyMoveToTester::hasOnlyMoveTo): Query the result
(WebCore::PathHasOnlyMoveToTester::testPathElement): Path iterator method.
(WebCore::Path::boundingRect): Modified to check for move-to only paths
(WebCore::Path::fastBoundingRect): Modified to check for move-to only paths
(WebCore::Path::isEmpty): Now uses the method that matches other platforms.
(WebCore::Path::hasCurrentPoint): Now uses CGPathIsEmpty directly
(WebCore::Path::transform) : Now uses CGPathIsEmpty directly

LayoutTests:

Work around a bug in CoreGraphics, that caused incorrect bounds for paths
consisting only of move-to elements. This causes problems in SVG, when the enormous
bounds prevented the drawing of things behind.

Will revert expectation file when expectations are stable.

Patch by Stephen Chenney <schenney@chromium.org>; on 2011-12-02
Reviewed by Darin Adler.

* platform/chromium-mac/svg/custom/zero-path-square-cap-rendering2-expected.txt: Removed.
* platform/chromium-win/svg/custom/zero-path-square-cap-rendering2-expected.txt: Removed.
* platform/mac/svg/custom/path-moveto-only-rendering-expected.png: Added.
* platform/mac/svg/custom/path-moveto-only-rendering-expected.txt: Added.
* platform/mac/svg/custom/subpaths-moveto-only-rendering-expected.png: Added.
* platform/mac/svg/custom/subpaths-moveto-only-rendering-expected.txt: Added.
* svg/custom/path-moveto-only-rendering.svg: Added.
* svg/custom/subpaths-moveto-only-rendering.svg: Added.
* svg/custom/zero-path-square-cap-rendering2-expected.txt: Modified text output
* platform/chromium/test_expectations.txt: Added flakiness for new tests from this patch

TBR=commit-queue@webkit.org
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=104175