PrintContext::pageProperty() shouldn't use 0 as page height.

third_party/WebKit/Source/core/page/PrintContext.cpp

Index: third_party/WebKit/Source/core/page/PrintContext.cpp
diff --git a/third_party/WebKit/Source/core/page/PrintContext.cpp b/third_party/WebKit/Source/core/page/PrintContext.cpp
index c02388f1138db5181ddd587d29afcf8c53c5824f..e62a2d2cefcc08afda9dd5c3b930c1c77984733d 100644
--- a/third_party/WebKit/Source/core/page/PrintContext.cpp
+++ b/third_party/WebKit/Source/core/page/PrintContext.cpp
@@ -259,7 +259,9 @@ String PrintContext::pageProperty(LocalFrame* frame, const char* propertyName, i
 {
     Document* document = frame->document();
     PrintContext printContext(frame);
-    printContext.begin(800); // Any width is OK here.
+    // Any non-zero size is OK here. We don't care about actual layout. We just want to collect
+    // @page rules and figure out what declarations apply on a given page (that may or may not exist).
+    printContext.begin(800, 1000);
     document->updateLayout();

[rune, 2015/12/10 09:44:50]

printContext.begin() will update the style/layout. This call can be removed.

[mstensho (USE GERRIT), 2015/12/10 09:45:58]

Done.

     RefPtr<ComputedStyle> style = document->styleForPage(pageNumber);