Revert of Cleanup: Remove unused PrintSettings shrink factors. (patchset #1 id:1 of https://codereview.chromium.org/1676953003/ )

Reason for revert:
Seems to break printing WebKit Linux MSAN (test times out): https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Linux%20MSAN/builds/8511

Original issue's description:
> Cleanup: Remove unused PrintSettings shrink factors.
>
> - They have been unused for 7 years.
> - The copy that is being used eventually moved to
>   third_party/WebKit/Source/core/page/PrintContext.cpp.
>
> Committed: https://crrev.com/5e8544fc5972711c5237e3bcd8c018a0b439f4f1
> Cr-Commit-Position: refs/heads/master@{#374553}

TBR=vitalybuka@chromium.org,tsepez@chromium.org,thestig@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.

Review URL: https://codereview.chromium.org/1697183002

Cr-Commit-Position: refs/heads/master@{#375464}

3 files changed, 21 insertions, 0 deletions

diff --git a/printing/print_settings.cc b/printing/print_settings.cc
index 159cfa5..7f555f0 100644
--- a/printing/print_settings.cc
+++ b/printing/print_settings.cc
@@ -131,6 +131,8 @@ PrintSettings::~PrintSettings() {
 void PrintSettings::Clear() {
   ranges_.clear();
   margin_type_ = DEFAULT_MARGINS;
+  min_shrink_ = 1.25;
+  max_shrink_ = 2.;
   desired_dpi_ = 72;
   selection_only_ = false;
   title_ = base::string16();
diff --git a/printing/print_settings.h b/printing/print_settings.h
index 6c4f8e7..08c7d56 100644
--- a/printing/print_settings.h
+++ b/printing/print_settings.h
@@ -143,6 +143,10 @@ class PRINTING_EXPORT PrintSettings {
 
   int desired_dpi() const { return desired_dpi_; }
 
+  double max_shrink() const { return max_shrink_; }
+
+  double min_shrink() const { return min_shrink_; }
+
   // Cookie generator. It is used to initialize PrintedDocument with its
   // associated PrintSettings, to be sure that each generated PrintedPage is
   // correctly associated with its corresponding PrintedDocument.
@@ -153,6 +157,19 @@ class PRINTING_EXPORT PrintSettings {
   // This permits printing selected pages only.
   PageRanges ranges_;
 
+  // By imaging to a width a little wider than the available pixels, thin pages
+  // will be scaled down a little, matching the way they print in IE and Camino.
+  // This lets them use fewer sheets than they would otherwise, which is
+  // presumably why other browsers do this. Wide pages will be scaled down more
+  // than this.
+  double min_shrink_;
+
+  // This number determines how small we are willing to reduce the page content
+  // in order to accommodate the widest line. If the page would have to be
+  // reduced smaller to make the widest line fit, we just clip instead (this
+  // behavior matches MacIE and Mozilla, at least)
+  double max_shrink_;
+
   // Desired visible dots per inch rendering for output. Printing should be
   // scaled to ScreenDpi/dpix*desired_dpi.
   int desired_dpi_;
diff --git a/printing/print_settings_conversion.cc b/printing/print_settings_conversion.cc
index 6200d7c..cd0c059 100644
--- a/printing/print_settings_conversion.cc
+++ b/printing/print_settings_conversion.cc
@@ -227,6 +227,8 @@ void PrintSettingsToJobSettingsDebug(const PrintSettings& settings,
   // common public constants. So just serialize in "debug" section.
   base::DictionaryValue* debug = new base::DictionaryValue;
   job_settings->Set("debug", debug);
+  debug->SetDouble("minShrink", settings.min_shrink());
+  debug->SetDouble("maxShrink", settings.max_shrink());
   debug->SetInteger("desiredDpi", settings.desired_dpi());
   debug->SetInteger("dpi", settings.dpi());
   debug->SetInteger("deviceUnitsPerInch", settings.device_units_per_inch());