Pepper: Expose visible_rect to PPB_VideoDecoder.GetPicture.

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 dd55fccbbfe1bc3037ac9b0c0b870c58f5ad10e4..786939c5141a45e72446ec0a7c29012832cd500c 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -50652,6 +50652,7 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="930528031" label="PPB_OpenGLES2DrawBuffers(Dev);1.0"/>
   <int value="930786862" label="PPB_Flash_Clipboard;5.0"/>
   <int value="941275733" label="PPB_Flash;12.6"/>
+  <int value="943174056" label="PPB_VideoDecoder;0.2"/>
   <int value="944161065" label="PPB_Flash_DRM;1.1"/>
   <int value="946515854" label="PPB_View(Dev);0.1"/>
   <int value="948969343" label="PPB_OpenGLES2;1.0"/>
@@ -50676,6 +50677,7 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="1155638369" label="PPB_WheelInputEvent;1.0"/>
   <int value="1161845861" label="PPB_NetAddress_Private;1.0"/>
   <int value="1173327824" label="PPB_OpenGLES2ChromiumEnableFeature;1.0"/>
+  <int value="1179678823" label="PPB_VideoDecoder;0.3"/>
   <int value="1188712923" label="PPB_Talk_Private;2.0"/>
   <int value="1218354710" label="PPB_VideoFrame;0.1"/>
   <int value="1260990020" label="PPB_Ext_Socket(Dev);0.2"/>