Page zoom improvements

content/public/common/page_zoom.h

Index: content/public/common/page_zoom.h
===================================================================
--- content/public/common/page_zoom.h	(revision 109526)
+++ content/public/common/page_zoom.h	(working copy)
@@ -7,6 +7,7 @@
 #pragma once
 
 #include "base/basictypes.h"
+#include "content/common/content_export.h"
 
 namespace content {
 
@@ -18,6 +19,24 @@
   PAGE_ZOOM_IN    = 1,
 };
 
+// The minimum zoom factor permitted for a page. This is an alternative to

[James Hawkins, 2011/11/14 18:09:05]

What do you mean by 'alternative'?

[csilv, 2011/11/14 23:10:29]

These are the values that we are going to use in Chromium, rather than WebKit's
default values.  The webkit minimum and maximum values are too narrow for
Chromium.  So we're defining our own min/max values and using those in the
appropriate places.

+// WebView::minTextSizeMultiplier.
+CONTENT_EXPORT extern const double kMinimumZoomFactor;
+
+// The maximum zoom factor permitted for a page. This is an alternative to
+// WebView::maxTextSizeMultiplier.
+CONTENT_EXPORT extern const double kMaximumZoomFactor;
+
+// Preset zoom factors that represent common zoom factors within the minimum
+// and maximum values. This array is guaranteed to be in sorted order.
+CONTENT_EXPORT extern const double kPresetZoomFactors[];
+
+// The number of zoom factors contained in the kPresetZoomFactors array.
+CONTENT_EXPORT extern const int kPresetZoomFactorsCount;
+
+// Epsilon for calculating zoom factor/level equality.
+CONTENT_EXPORT extern const double kPageZoomEpsilon;
+
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_PAGE_ZOOM_H_