Print Preview: Add option to rasterize PDFs and add JPEG compression.

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 11ae958f7a0f39ca8f319a4afb6316f184005c50..56b71dc9275295231be66c2a7aa73d284df23688 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -93648,6 +93648,7 @@ value.
   <int value="147373243" label="enable-deferred-image-decoding"/>
   <int value="157217034" label="enable-tab-for-desktop-share"/>
   <int value="157318016" label="AutomaticTabDiscarding:enabled"/>
+  <int value="173288154" label="PrintPdfAsImage:enabled"/>
   <int value="178337215" label="enable-md-history"/>
   <int value="180074362" label="memory-pressure-thresholds"/>
   <int value="194573877" label="MacViewsNativeDialogs:disabled"/>
@@ -93737,9 +93738,11 @@ value.
   <int value="606288133" label="enable-print-preview-register-promos"/>
   <int value="609112512" label="touch-selection-strategy"/>
   <int value="610545308" label="enable-potentially-annoying-security-features"/>
+  <int value="624317932" label="print-pdf-as-image"/>
   <int value="625273056" label="disable-boot-animation"/>
   <int value="628302973" label="NTPSnippets:enabled"/>
   <int value="630947363" label="touch-events"/>
+  <int value="635971109" label="PrintPdfAsImage:disabled"/>
   <int value="636425179" label="mhtml-generator-option"/>
   <int value="637396292" label="AllBookmarks:enabled"/>
   <int value="643725031" label="disable-touch-feedback"/>
@@ -99647,6 +99650,7 @@ value.
   <int value="16" label="NON_DEFAULT_MARGINS"/>
   <int value="17" label="DISTILL_PAGE_UNUSED"/>
   <int value="18" label="SCALING"/>
+  <int value="19" label="PRINT_AS_IMAGE"/>
 </enum>
 
 <enum name="PrivetNotificationsEvent" type="int">