Ensure SMILTime::From{Microseconds,SecondsD} always return finite values

Clamp the result to the [Min(), Latest()] range.
Remove the IsFinite() checks from SVGSMILElement::ParseOffsetValue() and
SVGSMILElement::ParseClockValue() since they will no longer trigger.

Bug: 1012665
Change-Id: I7183888fe1a0a2dd598fb42c152dee94d216d66c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1852924Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/master@{#704840}

third_party/blink/renderer/core/svg/animation/smil_time.h

@@ -70,10 +70,10 @@ class SMILTime {
     return base::TimeDelta::FromMicroseconds(1);
   }
   static constexpr SMILTime FromSecondsD(double seconds) {
-    return base::TimeDelta::FromSecondsD(seconds);
+    return std::min(SMILTime(base::TimeDelta::FromSecondsD(seconds)), Latest());
   }
   static constexpr SMILTime FromMicroseconds(int64_t us) {
-    return base::TimeDelta::FromMicroseconds(us);
+    return std::min(SMILTime(base::TimeDelta::FromMicroseconds(us)), Latest());
   }
 
   // Used for computing progress. Don't use for anything else.

third_party/blink/renderer/core/svg/animation/svg_smil_element.cc

@@ -321,10 +321,7 @@ SMILTime SVGSMILElement::ParseOffsetValue(const String& data) {
     result = parse.ToDouble(&ok);
   if (!ok)
     return SMILTime::Unresolved();
-  SMILTime offset_value = SMILTime::FromSecondsD(result);
-  if (!offset_value.IsFinite())
-    return SMILTime::Unresolved();
-  return offset_value;
+  return SMILTime::FromSecondsD(result);
 }
 
 SMILTime SVGSMILElement::ParseClockValue(const String& data) {
@@ -361,10 +358,7 @@ SMILTime SVGSMILElement::ParseClockValue(const String& data) {
 
   if (!ok)
     return SMILTime::Unresolved();
-  SMILTime clock_value = SMILTime::FromSecondsD(result);
-  if (!clock_value.IsFinite())
-    return SMILTime::Unresolved();
-  return clock_value;
+  return SMILTime::FromSecondsD(result);
 }
 
 bool SVGSMILElement::ParseCondition(const String& value,