Adds the contextMessage field to notifications.

ui/message_center/cocoa/notification_controller.mm

Index: ui/message_center/cocoa/notification_controller.mm
diff --git a/ui/message_center/cocoa/notification_controller.mm b/ui/message_center/cocoa/notification_controller.mm
index 965ba423f24432ae86ef611ed1cd5b7c649cbe9e..ab0187859abff637e2fb0fe9ca0f0fd9cc1b3822 100644
--- a/ui/message_center/cocoa/notification_controller.mm
+++ b/ui/message_center/cocoa/notification_controller.mm
@@ -203,6 +203,9 @@
 // Initializes message_ in the given frame.
 - (void)configureBodyInFrame:(NSRect)rootFrame;
 
+// Initializes contextMessage_ in the given frame.
+- (void)configureContextMessageInFrame:(NSRect)rootFrame;
+
 // Creates a NSTextField that the caller owns configured as a label in a
 // notification.
 - (NSTextField*)newLabelWithFrame:(NSRect)frame;
@@ -260,6 +263,10 @@
   [self configureBodyInFrame:rootFrame];
   [rootView addSubview:message_];
 
+  // Create the context message body.
+  [self configureContextMessageInFrame:rootFrame];
+  [rootView addSubview:contextMessage_];
+
   // Populate the data.
   [self updateNotification:notification_];
 }
@@ -285,9 +292,15 @@
 
   CGFloat messageTopGap =
       roundf([[message_ font] ascender] - [[message_ font] capHeight]);
+  CGFloat messageBottomGap = roundf(fabs([[message_ font] descender]));
   CGFloat messagePadding =
       message_center::kTextTopPadding - titleBottomGap - messageTopGap;
 
+  CGFloat contextMessageTopGap = roundf(
+      [[contextMessage_ font] ascender] - [[contextMessage_ font] capHeight]);
+  CGFloat contextMessagePadding =
+      message_center::kTextTopPadding - messageBottomGap - contextMessageTopGap;
+
   // Set the title and recalculate the frame.
   [title_ setStringValue:base::SysUTF16ToNSString(
       [self wrapText:notification_->title()
@@ -300,26 +313,50 @@
   // Set the message and recalculate the frame.
   [message_ setStringValue:base::SysUTF16ToNSString(
       [self wrapText:notification_->message()
-            forField:title_
+            forField:message_
        maxNumberOfLines:message_center::kMessageExpandedLineLimit])];
-  [message_ setHidden:NO];
   [message_ sizeToFit];
   NSRect messageFrame = [message_ frame];
-  messageFrame.origin.y =
-      NSMinY(titleFrame) - messagePadding - NSHeight(messageFrame);
-  messageFrame.size.height = NSHeight([message_ frame]);
 
-  // Create the list item views (up to a maximum).
-  [listItemView_ removeFromSuperview];
+  // If there are list items, then the message_ view should not be displayed.
   const std::vector<message_center::NotificationItem>& items =
       notification->items();
-  NSRect listFrame = NSZeroRect;
   if (items.size() > 0) {
-    // If there are list items, then the message_ view should not be displayed.
     [message_ setHidden:YES];
     messageFrame.origin.y = titleFrame.origin.y;
     messageFrame.size.height = 0;
+  } else {
+    [message_ setHidden:NO];
+    messageFrame.origin.y =
+        NSMinY(titleFrame) - messagePadding - NSHeight(messageFrame);
+    messageFrame.size.height = NSHeight([message_ frame]);
+  }
 
+  // Set the context message and recalculate the frame.
+  [contextMessage_ setStringValue:base::SysUTF16ToNSString(
+      [self wrapText:notification_->context_message()
+            forField:contextMessage_
+       maxNumberOfLines:message_center::kContextMessageLineLimit])];
+  [contextMessage_ sizeToFit];
+  NSRect contextMessageFrame = [contextMessage_ frame];
+
+  if (notification_->context_message().empty()) {
+    [contextMessage_ setHidden:YES];
+    contextMessageFrame.origin.y = messageFrame.origin.y;
+    contextMessageFrame.size.height = 0;
+  } else {
+    [contextMessage_ setHidden:NO];
+    contextMessageFrame.origin.y =
+        NSMinY(messageFrame) -
+        contextMessagePadding -
+        NSHeight(contextMessageFrame);
+    contextMessageFrame.size.height = NSHeight([contextMessage_ frame]);
+  }
+
+  // Create the list item views (up to a maximum).
+  [listItemView_ removeFromSuperview];
+  NSRect listFrame = NSZeroRect;
+  if (items.size() > 0) {
     listFrame = [self currentContentRect];
     listFrame.origin.y = 0;
     listFrame.size.height = 0;
@@ -348,10 +385,10 @@
     }
     // TODO(thakis): The spacing is not completely right.
     CGFloat listTopPadding =
-        message_center::kTextTopPadding - messageTopGap;
+        message_center::kTextTopPadding - contextMessageTopGap;
     listFrame.size.height = y;
     listFrame.origin.y =
-        NSMinY(titleFrame) - listTopPadding - NSHeight(listFrame);
+        NSMinY(contextMessageFrame) - listTopPadding - NSHeight(listFrame);
     [listItemView_ setFrame:listFrame];
     [[self view] addSubview:listItemView_];
   }
@@ -361,7 +398,7 @@
   NSRect progressBarFrame = NSZeroRect;
   if (notification->type() == message_center::NOTIFICATION_TYPE_PROGRESS) {
     progressBarFrame = [self currentContentRect];
-    progressBarFrame.origin.y = NSMinY(messageFrame) -
+    progressBarFrame.origin.y = NSMinY(contextMessageFrame) -
         message_center::kProgressBarTopPadding -
         message_center::kProgressBarThickness;
     progressBarFrame.size.height = message_center::kProgressBarThickness;
@@ -376,7 +413,7 @@
 
   // If the bottom-most element so far is out of the rootView's bounds, resize
   // the view.
-  CGFloat minY = NSMinY(messageFrame);
+  CGFloat minY = NSMinY(contextMessageFrame);
   if (listItemView_ && NSMinY(listFrame) < minY)
     minY = NSMinY(listFrame);
   if (progressBarView_ && NSMinY(progressBarFrame) < minY)
@@ -386,6 +423,7 @@
     rootFrame.size.height += delta;
     titleFrame.origin.y += delta;
     messageFrame.origin.y += delta;
+    contextMessageFrame.origin.y += delta;
     listFrame.origin.y += delta;
     progressBarFrame.origin.y += delta;
   }
@@ -456,6 +494,7 @@
   rootFrame.size.height += NSHeight(frame);
   titleFrame.origin.y += NSHeight(frame);
   messageFrame.origin.y += NSHeight(frame);
+  contextMessageFrame.origin.y += NSHeight(frame);
   listFrame.origin.y += NSHeight(frame);
   progressBarFrame.origin.y += NSHeight(frame);
 
@@ -467,6 +506,7 @@
     rootFrame.size.height += bottomAdjust;
     titleFrame.origin.y += bottomAdjust;
     messageFrame.origin.y += bottomAdjust;
+    contextMessageFrame.origin.y += bottomAdjust;
     listFrame.origin.y += bottomAdjust;
     progressBarFrame.origin.y += bottomAdjust;
   }
@@ -474,6 +514,7 @@
   [[self view] setFrame:rootFrame];
   [title_ setFrame:titleFrame];
   [message_ setFrame:messageFrame];
+  [contextMessage_ setFrame:contextMessageFrame];
   [listItemView_ setFrame:listFrame];
   [progressBarView_ setFrame:progressBarFrame];
 
@@ -611,11 +652,22 @@
   message_.reset([self newLabelWithFrame:frame]);
   [message_ setAutoresizingMask:NSViewMinYMargin];
   [message_ setTextColor:gfx::SkColorToCalibratedNSColor(
-      message_center::kDimTextColor)];
+      message_center::kRegularTextColor)];
   [message_ setFont:
       [NSFont messageFontOfSize:message_center::kMessageFontSize]];
 }
 
+- (void)configureContextMessageInFrame:(NSRect)rootFrame {
+  NSRect frame = [self currentContentRect];
+  frame.size.height = 0;
+  contextMessage_.reset([self newLabelWithFrame:frame]);
+  [contextMessage_ setAutoresizingMask:NSViewMinYMargin];
+  [contextMessage_ setTextColor:gfx::SkColorToCalibratedNSColor(
+      message_center::kDimTextColor)];
+  [contextMessage_ setFont:
+      [NSFont messageFontOfSize:message_center::kMessageFontSize]];
+}
+
 - (NSTextField*)newLabelWithFrame:(NSRect)frame {
   NSTextField* label = [[NSTextField alloc] initWithFrame:frame];
   [label setDrawsBackground:NO];