Bug 1430608: Make nsMediaFeatures work with a document, not a pres context. r=heycam

Returning a zero-sized viewport in the case there's no shell / pres context.

For now, no other change yet. After this we can start tweaking the ShadowRoot
Stylist setup, and even try to return computed styles without a document \o/.

MozReview-Commit-ID: 3cT2PKQISri

Author: emilio

dom/base/nsIDocument.h

@@ -2215,6 +2215,16 @@ class nsIDocument : public nsINode,
     mIsBeingUsedAsImage = true;
   }
 
+  bool IsSVGGlyphsDocument() const
+  {
+    return mIsSVGGlyphsDocument;
+  }
+
+  void SetIsSVGGlyphsDocument()
+  {
+    mIsSVGGlyphsDocument = true;
+  }
+
   bool IsResourceDoc() const {
     return IsBeingUsedAsImage() || // Are we a helper-doc for an SVG image?
       mHasDisplayDocument;         // Are we an external resource doc?
@@ -3542,6 +3552,9 @@ class nsIDocument : public nsINode,
   // created.
   bool mIsShadowDOMEnabled : 1;
 
+  // True if this document is for an SVG-in-OpenType font.
+  bool mIsSVGGlyphsDocument : 1;
+
   // Whether <style scoped> support is enabled in this document.
   enum { eScopedStyle_Unknown, eScopedStyle_Disabled, eScopedStyle_Enabled };
   unsigned int mIsScopedStyleEnabled : 2;

gfx/thebes/gfxSVGGlyphs.cpp

@@ -157,11 +157,8 @@ gfxSVGGlyphsDocument::SetupPresentation()
     nsCOMPtr<nsIPresShell> presShell;
     rv = viewer->GetPresShell(getter_AddRefs(presShell));
     NS_ENSURE_SUCCESS(rv, rv);
-    nsPresContext* presContext = presShell->GetPresContext();
-    presContext->SetIsGlyph(true);
-
     if (!presShell->DidInitialize()) {
-        nsRect rect = presContext->GetVisibleArea();
+        nsRect rect = presShell->GetPresContext()->GetVisibleArea();
         rv = presShell->Initialize(rect.Width(), rect.Height());
         NS_ENSURE_SUCCESS(rv, rv);
     }
@@ -395,6 +392,7 @@ gfxSVGGlyphsDocument::ParseDocument(const uint8_t *aBuffer, uint32_t aBufLen)
 
     // Set this early because various decisions during page-load depend on it.
     document->SetIsBeingUsedAsImage();
+    document->SetIsSVGGlyphsDocument();
     document->SetReadyStateInternal(nsIDocument::READYSTATE_UNINITIALIZED);
 
     nsCOMPtr<nsIStreamListener> listener;

layout/base/nsPresContext.h

@@ -1131,14 +1131,6 @@ class nsPresContext : public nsISupports,
 
   void NotifyNonBlankPaint();
 
-  bool IsGlyph() const {
-    return mIsGlyph;
-  }
-
-  void SetIsGlyph(bool aValue) {
-    mIsGlyph = aValue;
-  }
-
   bool UsesRootEMUnits() const {
     return mUsesRootEMUnits;
   }