Add UMAs for numerical approximation of table-based transfer functions.

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 6ffdf566a3bbb9aa52c68d745e4fa1dad3359ae4..50679f4a64319dec11e39636532aecd003fb2dcf 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -4409,6 +4409,24 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <summary>Gamma properties of destination color space.</summary>
 </histogram>
 
+<histogram name="Blink.ColorSpace.Destination.ExtractedRawData"
+    enum="ColorSpaceExtractedRawDataResult">
+  <owner>ccameron@chromium.org</owner>
+  <summary>
+    Whether or not the output color space ICC profile was able to produce raw
+    transfer function tables.
+  </summary>
+</histogram>
+
+<histogram name="Blink.ColorSpace.Destination.LinearFitError">
+  <owner>ccameron@chromium.org</owner>
+  <summary>
+    The L-infinity error (in 8-bit values) of the numerical approximation of
+    table-based ICC profile transfer functions, when falling back to a linear
+    approximation.
+  </summary>
+</histogram>
+
 <histogram name="Blink.ColorSpace.Destination.Matrix"
     enum="ColorSpaceMatrixResult">
   <owner>ccameron@chromium.org</owner>
@@ -4418,6 +4436,24 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Blink.ColorSpace.Destination.NonlinearFitConverged"
+    enum="ColorSpaceNonlinearFitConverged">
+  <owner>ccameron@chromium.org</owner>
+  <summary>
+    Whether or not the nonlinear least squares fit of the table-based ICC
+    profile transfer function converged.
+  </summary>
+</histogram>
+
+<histogram name="Blink.ColorSpace.Destination.NonlinearFitError">
+  <owner>ccameron@chromium.org</owner>
+  <summary>
+    The L-infinity error (in 8-bit values) of the numerical approximation of
+    table-based ICC profile transfer functions, when the nonlinear approximation
+    converged.
+  </summary>
+</histogram>
+
 <histogram name="Blink.ColorSpace.Destination.Numerical"
     enum="ColorSpaceNumericalResult">
   <owner>ccameron@chromium.org</owner>
@@ -4427,6 +4463,24 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Blink.ColorSpace.Destination.OneMinusTMax">
+  <owner>ccameron@chromium.org</owner>
+  <summary>
+    One minus the maximum value of table-based ICC profile transfer functions as
+    an 8-bit fixed-point value. This histogram is temporary, to see if we can
+    bake in the assumption that it will almost always be 255.
+  </summary>
+</histogram>
+
+<histogram name="Blink.ColorSpace.Destination.TMin">
+  <owner>ccameron@chromium.org</owner>
+  <summary>
+    The minimum value of table-based ICC profile transfer functions as an 8-bit
+    fixed-point value. This histogram is temporary, to see if we can bake in the
+    assumption that it will almost always be 0.
+  </summary>
+</histogram>
+
 <histogram name="Blink.ColorSpace.Source" enum="Gamma">
   <owner>ccameron@chromium.org</owner>
   <summary>Gamma properties of image color space.</summary>
@@ -82761,14 +82815,24 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="30" label="More Than 30"/>
 </enum>
 
+<enum name="ColorSpaceExtractedRawDataResult" type="int">
+  <int value="0" label="Failed to extract."/>
+  <int value="1" label="Successfully extracted."/>
+</enum>
+
 <enum name="ColorSpaceMatrixResult" type="int">
   <int value="0" label="Failed to extract toXYZD50 matrix."/>
   <int value="1" label="Successfully extracted toXYZD50 matrix."/>
 </enum>
 
+<enum name="ColorSpaceNonlinearFitConverged" type="int">
+  <int value="0" label="Did not converge."/>
+  <int value="1" label="Converged."/>
+</enum>
+
 <enum name="ColorSpaceNumericalResult" type="int">
-  <int value="0" label="Failed to extract analytical transfer function."/>
-  <int value="1" label="Successfully extracted analytical transfer function."/>
+  <int value="0" label="Failed to extract."/>
+  <int value="1" label="Successfully extracted."/>
 </enum>
 
 <enum name="CombinedHttpResponseAndNetErrorCode" type="int">